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denkosundefined

Don't forget END command after NEWK
Try this:
NEWK
8 8
1 0
END
ORBITALS
Pd_Cu_Act
1 0
END
END

Other Questions
denkosundefined

Hi!
I want to calculate the electric field gradient using POTC keyword (with CRYSTAL14) and am confused about the output. From the convention, the EFG components value should follow |CC|>|BB|>|AA|, which is not the case here. So my question is, can I consider the coordinate system to have an issue and just sort the output values to fulfill the convention and "rotate" the coordinate axes "by hand", or how should I interpret the output?

Thank you for your help!

TOTAL ELECTROSTATIC POTENTIAL

3 POINT COORDINATES V0 V1(Z) V1(X) V1(Y)

1 1.9790 2.3308 1.8870 -2.43511E+01 -1.44599E-04 -3.08862E-02 -2.33966E-02
2 -7.8558 -3.2175 1.8921 -2.75956E+01 3.35688E-05 -1.79861E-03 -5.24897E-03
3 -2.4880 0.9348 1.8905 -5.97785E+01 3.49451E-05 1.44597E-02 -8.08926E-03

TRACELESS ELECTRIC FIELD GRADIENT TENSOR

POINT 1 POSITION 1.9790 2.3308 1.8870

TENSOR IN ORIGINAL CARTESIAN AXES
XX -4.074007E-02 YY 1.062909E-02 ZZ 3.011098E-02 XY -3.411483E-02 XZ -7.494557E-05 YZ -2.045206E-04

TENSOR IN PRINCIPAL AXES SYSTEM
AA -5.775846E-02 BB 2.763815E-02 CC 3.012031E-02

PRINCIPAL AXES
X Y Z
A 8.948364E-01 4.463906E-01 1.802221E-03
B -4.456747E-01 8.931575E-01 6.036308E-02
C 2.533584E-02 -5.481828E-02 9.981749E-01

ANGLES BETWEEN PRINCIPAL AXES AND ORIGINAL AXES (DEGREES)
X Y Z
A 26.512576 63.487657 89.896740
B 116.466512 26.727256 86.539347
C 88.548208 93.142432 3.462197

Other Questions
GiacomoAmbrogioundefined

The Department of Chemistry and the Thomas Young Centre at Imperial College London 🇬🇧 and the Theoretical Chemistry Group of the University of Torino 🇮🇹, in collaboration with the Computational Materials Science Group of the Science and Technology Facilities Council (STFC), are organising the

logo0.png

MSSC2026 Summer School on Ab initio Modelling in Solid State Chemistry

The School is designed for Master and Ph.D. students, as well as for post-docs and researchers who have an interest in getting or strengthening a background in:

⚛️ Computational Solid State Chemistry 🧠 Physics 🧱 Materials Science 🌐 Surface- and Nano-Science

📅 The week-long School consists of morning lectures and afternoon hands-on tutorial sessions, where the formal framework and functionalities of the CRYSTAL electronic structure package will be explored.

📌 While we strongly encourage in-person participation, we also offer the possibility to attend remotely through streaming of morning lectures and afternoon hands-on tutorials.

📝 Participants will have the opportunity to present their research at a poster session.

👉 You can register here!
Friday 8 May - Deadline for payment of early bird fees.

See the School website for further details.

Events
rbnfritzundefined

Hi,

I am trying to reproduce the results of an article that specifically focuses on LiNbO3. When using the 'BETAVIB' option, the manual states that the estimation is performed via "d", and the result is printed in the output as:

" VIBRATIONAL POCKELS TENSOR, FREQ.=

DIRECTION CHI(2)"
And

VIBRATIONAL SHG TENSOR, FREQ.=

DIRECTION CHI(2)

But in this article https://onlinelibrary.wiley.com/doi/full/10.1002/pssb.20230005, they (or maybe I misunderstood) said they compute beta using crystal17, and the same is true in this one: https://www.sciencedirect.com/science/article/pii/S0927025623005232. Also, https://journals.aps.org/prb/abstract/10.1103/PhysRevB.107.045140 seems to follow the same rule.

I want to clarify which term is printed in the output file "Using" BETAVIB, and in what unit it is printed?.

Best.
Rubén Fritz.

Response Properties (CPHF/KS)
zhuytundefined

I want to build the carbon nanotube supercell with keyword “supercell ”， unfortunately， the crystal reports errors：“**** MULTIP **** SYMMOPS DO NOT FORM A GROUP ”
the INPUT file:
TEST07_1 - armchair C NANOTUBE - 6-21G, PBEsol
SLAB
77
2.47
1
6 -0.33333333333 0.33333333333 0.
SWCNT
5 5
supercell
2
end

Geometry Optimisations
job314undefined

Yes Aleks that's what I meant. But I see now convergence with k points thank you

Harmonic and Anharmonic Lattice Dynamics and Thermodynamics
job314undefined

I see, thank you

Vibrational Spectroscopies: IR, Raman, INS
Chhatraundefined

Thank you so much!

Electron Charge Density Analysis
Jia-Lin Changundefined

​Dear Prof. Erba,

Thank you for your clear explanation.

Vibrational Spectroscopies: IR, Raman, INS
aerbaundefined

Hi,

With CRYSTAL (from the PROPERTIES module actually) one can output the Hartree+EN potential in the all-electron case in 2D or 3D grids with POTM and POT3 keywords, respectively. In the latter case, the output is in .cube format. But I am afraid that currently there is no keyword to plot the XC part of the potential on a grid.

Other Questions
rcecconelloundefined

Dear CRYSTAL users,

I'm working with a molecular crystal, and I need to calculate the forces acting on the atoms in different configurations. We want to verify if the BSSE correction is important in the determination of forces. In addition, is the calculation of forces with MOLEBSSE comparable with the calculation without this correction, since we don't employ the reciprocal space in the first one?

We need some light on the right approach for the calculation with MOLEBSSE. We've tested a few configurations, and the resulting forces varie considerable. For instance, do we need to "isolate" all the molecules of the cell, or just one? Also, how big should the distance R and the number of neighbours to be searched be? In our system, the conventional cell has 4 diatomic molecules.

Single-Point Calculations
CaesarSaladundefined

Hi Alessandro, thanks for the info! Much appreciated, Chris.

Other Questions
aerbaundefined

It was a great week! Let me share a group picture from the event:

QMMC2026_Volta_Redonda.jpeg

Events
Drmajouri2025undefined

Thank you, this is too clear and very helpful.

Vibrational Spectroscopies: IR, Raman, INS
fbodoundefined

Hi QMQDCHEM ,
Could you share your BAND.DAT file so that I can do some quick test?
Thanks

CRYSTALClear
QMQDCHEMundefined

Thank you! This is much more comfortable.

Band Structure
fbodoundefined

Dear Alexander,
We runned a few tests, and, indeed, we found the same behavior. This, though, is not due to an error in the definition in the basis set, but rather to some formatting issue, since the Cs goes up to P4 the code expects that also the Iodine pseudo goes up to P4 and fills the missing coefficients and exponents with zeros.

Luckily there is an easy workaround to this, it is sufficient to flip Cs and I definition in the geometry and the results are the same as the one you obtained by defining the basis set in the input as you can see from my test.

I will leave you here two output snippets hoping that they help clarifying the issue:

Cs defined before I in the geometry section INPUT COORDINATES ATOM AT. N. COORDINATES 1 38 5.000000000000E-01 5.000000000000E-01 5.000000000000E-01 2 55 0.000000000000E+00 0.000000000000E+00 0.000000000000E+00 3 53 0.000000000000E+00 5.000000000000E-01 5.000000000000E-01 [...] ******************************************************************************* *** PSEUDOPOTENTIAL INFORMATION *** ******************************************************************************* ATOMIC NUMBER 38, NUCLEAR CHARGE 10.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 6.9334610 135.2710429 0 4.1140038 17.9440714 0 P1 TMS 7.2168166 29.4380813 0 7.1736962 58.8806749 0 3.0227988 4.9362827 0 2.8656990 9.7233521 0 P2 TMS 6.3215146 11.9072392 0 6.3914995 17.8595514 0 1.7697266 2.1991802 0 1.6367717 2.8935709 0 P3 TMS 4.2441984 -5.5093333 0 4.2291645 -7.3046417 0 ATOMIC NUMBER 55, NUCLEAR CHARGE 9.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 4.0811192 84.5477223 0 2.4215224 16.6540350 0 P1 TMS 5.5339726 52.3496307 0 5.5067944 104.6994132 0 2.2809616 8.8065577 0 2.1034905 17.6166111 0 P2 TMS 1.8131494 5.2689855 0 1.8077217 7.9036419 0 0.8729040 1.3364313 0 0.8587203 2.0056513 0 P3 TMS 5.2170839 -16.4976543 0 5.1481965 -23.3081313 0 1.5805995 -2.2368273 0 1.3478959 -2.2269420 0 P4 TMS 1.8077398 -2.5041987 0 1.8050613 -3.1382445 0 ATOMIC NUMBER 53, NUCLEAR CHARGE 25.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 40.0333760 49.9896490 0 17.3005760 281.0065560 0 8.8517200 61.4167390 0 P1 TMS 15.7201410 67.4162390 0 15.2082220 134.8076960 0 8.2941860 14.5665480 0 7.7539490 28.9684220 0 P2 TMS 13.8177510 35.5387560 0 13.5878050 53.3397590 0 6.9476300 9.7164660 0 6.9600990 14.9775000 0 P3 TMS 18.5229500 -20.1766180 0 18.2510350 -26.0880770 0 7.5579010 -0.2204340 0 7.5974040 -0.2216460 0 P4 TMS 0.0000000 0.0000000 0 0.0000000 0.0000000 0 I defined before Cs in the geometry section INPUT COORDINATES ATOM AT. N. COORDINATES 1 38 5.000000000000E-01 5.000000000000E-01 5.000000000000E-01 2 53 0.000000000000E+00 5.000000000000E-01 5.000000000000E-01 3 55 0.000000000000E+00 0.000000000000E+00 0.000000000000E+00 [...] ******************************************************************************* *** PSEUDOPOTENTIAL INFORMATION *** ******************************************************************************* ATOMIC NUMBER 38, NUCLEAR CHARGE 10.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 6.9334610 135.2710429 0 4.1140038 17.9440714 0 P1 TMS 7.2168166 29.4380813 0 7.1736962 58.8806749 0 3.0227988 4.9362827 0 2.8656990 9.7233521 0 P2 TMS 6.3215146 11.9072392 0 6.3914995 17.8595514 0 1.7697266 2.1991802 0 1.6367717 2.8935709 0 P3 TMS 4.2441984 -5.5093333 0 4.2291645 -7.3046417 0 ATOMIC NUMBER 53, NUCLEAR CHARGE 25.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 40.0333760 49.9896490 0 17.3005760 281.0065560 0 8.8517200 61.4167390 0 P1 TMS 15.7201410 67.4162390 0 15.2082220 134.8076960 0 8.2941860 14.5665480 0 7.7539490 28.9684220 0 P2 TMS 13.8177510 35.5387560 0 13.5878050 53.3397590 0 6.9476300 9.7164660 0 6.9600990 14.9775000 0 P3 TMS 18.5229500 -20.1766180 0 18.2510350 -26.0880770 0 7.5579010 -0.2204340 0 7.5974040 -0.2216460 0 ATOMIC NUMBER 55, NUCLEAR CHARGE 9.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 4.0811192 84.5477223 0 2.4215224 16.6540350 0 P1 TMS 5.5339726 52.3496307 0 5.5067944 104.6994132 0 2.2809616 8.8065577 0 2.1034905 17.6166111 0 P2 TMS 1.8131494 5.2689855 0 1.8077217 7.9036419 0 0.8729040 1.3364313 0 0.8587203 2.0056513 0 P3 TMS 5.2170839 -16.4976543 0 5.1481965 -23.3081313 0 1.5805995 -2.2368273 0 1.3478959 -2.2269420 0 P4 TMS 1.8077398 -2.5041987 0 1.8050613 -3.1382445 0

I hope this helps

Bug Reports
aerbaundefined

Hi,

We have run some tests and we have identified the origin of the problem. The calculation fails in the evaluation of the Fermi energy in the NEWK option (so before getting to the BOLTZTRA step) because of large memory requirements due to a very large number of k-points being asked and because of the replicated-memory parallel implementation of that bit of code.

In that part of the code, with Pproperties (parallel version), data are replicated in memory by each process.

We have run tests on this system in parallel with different number of processes (on a computing node with 128 CPU cores) and for different shrinking factor parameters of the NEWK keyword. Results are summarized in the table below:

analysis.png

"ok" marks combinations for which the calculation run without errors. The trend is clear and can be rationalized as follows:

reducing the number of k points reduces memory requirments reducing the number of MPI processes effectively increases the available memory/process

Hope this clarifies things and helps find a way forward,

Bug Reports
aerbaundefined

Hi,

I used space group 186 for ZnO that corresponds to the one you mention. In the character table printed by CRYSTAL only those irreps that are actually used to build symmetry-adapted Bloch functions are shown. I have updated my original post above to show the irrep labels in the character tables, which match those found in the printing of the eigenvalues.

Hope this clarifies things,

Band Structure
andrejscundefined

Poking further, since the last error is that of MPI and not of CRYSTAL, I launched the same input with NEWK 8 8 as a single-core process (with Pproperties), and this time the error was different:

85-C( 3 2 4) 86-C( 4 2 4) 87-C( 5 2 4) 88-C( 3 3 4) 89-C( 4 3 4) 90-R( 4 4 4) ERROR **** PROJVR **** NULL COMPONENT 0.222045E-15 0.100000E-07

for

ROTREF ATOMS 10 # this is Manganese 0 0 0 # I also tried this with different cell indices 12 # P5 0 0 0 8 # P2 0 0 0

and then

85-C( 3 2 4) 86-C( 4 2 4) 87-C( 5 2 4) 88-C( 3 3 4) 89-C( 4 3 4) 90-R( 4 4 4) ERROR **** RHOLSK **** BASIS SET LINEARLY DEPENDENT

for the following input:

ROTREF ATOMS 10 1 0 0 12 1 0 1 8 1 1 0

As well as for other indices

Geometry Editing

  • Discuss features, updates, and general use of the CRYSTAL module

    Single-Point Calculations
    Basis Sets
    Geometry Optimisations
    Harmonic and Anharmonic Lattice Dynamics and Thermodynamics
    Vibrational Spectroscopies: IR, Raman, INS
    Elasticity, Piezoelectricity, Photoelasticity
    Equation-of-State and Pressure
    Spin-Orbit Coupling and SCDFT
    Geometry Editing
    Response Properties (CPHF/KS)
    Other Questions
    83 Topics
    373 Posts
    rbnfritzundefined

    Hi,

    I am trying to reproduce the results of an article that specifically focuses on LiNbO3. When using the 'BETAVIB' option, the manual states that the estimation is performed via "d", and the result is printed in the output as:

    " VIBRATIONAL POCKELS TENSOR, FREQ.=

    DIRECTION CHI(2)"
    And

    VIBRATIONAL SHG TENSOR, FREQ.=

    DIRECTION CHI(2)

    But in this article https://onlinelibrary.wiley.com/doi/full/10.1002/pssb.20230005, they (or maybe I misunderstood) said they compute beta using crystal17, and the same is true in this one: https://www.sciencedirect.com/science/article/pii/S0927025623005232. Also, https://journals.aps.org/prb/abstract/10.1103/PhysRevB.107.045140 seems to follow the same rule.

    I want to clarify which term is printed in the output file "Using" BETAVIB, and in what unit it is printed?.

    Best.
    Rubén Fritz.

  • Discuss features, updates, and general use of the PROPERTIES module

    Band Structure
    Density-of-States
    Electron Charge Density Analysis
    Electron Momentum Density Analysis
    TOPOND
    Other Questions
    24 Topics
    84 Posts
    denkosundefined

    Don't forget END command after NEWK
    Try this:
    NEWK
    8 8
    1 0
    END
    ORBITALS
    Pd_Cu_Act
    1 0
    END
    END

  • Seek assistance, discuss troubleshooting tips for any technical problem you encounter and report bugs

    Installation and Configuration
    Running CRYSTAL in Parallel
    Bug Reports
    Interfacing CRYSTAL with Other Software
    18 Topics
    90 Posts
    fbodoundefined

    Dear Alexander,
    We runned a few tests, and, indeed, we found the same behavior. This, though, is not due to an error in the definition in the basis set, but rather to some formatting issue, since the Cs goes up to P4 the code expects that also the Iodine pseudo goes up to P4 and fills the missing coefficients and exponents with zeros.

    Luckily there is an easy workaround to this, it is sufficient to flip Cs and I definition in the geometry and the results are the same as the one you obtained by defining the basis set in the input as you can see from my test.

    I will leave you here two output snippets hoping that they help clarifying the issue:

    Cs defined before I in the geometry section INPUT COORDINATES ATOM AT. N. COORDINATES 1 38 5.000000000000E-01 5.000000000000E-01 5.000000000000E-01 2 55 0.000000000000E+00 0.000000000000E+00 0.000000000000E+00 3 53 0.000000000000E+00 5.000000000000E-01 5.000000000000E-01 [...] ******************************************************************************* *** PSEUDOPOTENTIAL INFORMATION *** ******************************************************************************* ATOMIC NUMBER 38, NUCLEAR CHARGE 10.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 6.9334610 135.2710429 0 4.1140038 17.9440714 0 P1 TMS 7.2168166 29.4380813 0 7.1736962 58.8806749 0 3.0227988 4.9362827 0 2.8656990 9.7233521 0 P2 TMS 6.3215146 11.9072392 0 6.3914995 17.8595514 0 1.7697266 2.1991802 0 1.6367717 2.8935709 0 P3 TMS 4.2441984 -5.5093333 0 4.2291645 -7.3046417 0 ATOMIC NUMBER 55, NUCLEAR CHARGE 9.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 4.0811192 84.5477223 0 2.4215224 16.6540350 0 P1 TMS 5.5339726 52.3496307 0 5.5067944 104.6994132 0 2.2809616 8.8065577 0 2.1034905 17.6166111 0 P2 TMS 1.8131494 5.2689855 0 1.8077217 7.9036419 0 0.8729040 1.3364313 0 0.8587203 2.0056513 0 P3 TMS 5.2170839 -16.4976543 0 5.1481965 -23.3081313 0 1.5805995 -2.2368273 0 1.3478959 -2.2269420 0 P4 TMS 1.8077398 -2.5041987 0 1.8050613 -3.1382445 0 ATOMIC NUMBER 53, NUCLEAR CHARGE 25.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 40.0333760 49.9896490 0 17.3005760 281.0065560 0 8.8517200 61.4167390 0 P1 TMS 15.7201410 67.4162390 0 15.2082220 134.8076960 0 8.2941860 14.5665480 0 7.7539490 28.9684220 0 P2 TMS 13.8177510 35.5387560 0 13.5878050 53.3397590 0 6.9476300 9.7164660 0 6.9600990 14.9775000 0 P3 TMS 18.5229500 -20.1766180 0 18.2510350 -26.0880770 0 7.5579010 -0.2204340 0 7.5974040 -0.2216460 0 P4 TMS 0.0000000 0.0000000 0 0.0000000 0.0000000 0 I defined before Cs in the geometry section INPUT COORDINATES ATOM AT. N. COORDINATES 1 38 5.000000000000E-01 5.000000000000E-01 5.000000000000E-01 2 53 0.000000000000E+00 5.000000000000E-01 5.000000000000E-01 3 55 0.000000000000E+00 0.000000000000E+00 0.000000000000E+00 [...] ******************************************************************************* *** PSEUDOPOTENTIAL INFORMATION *** ******************************************************************************* ATOMIC NUMBER 38, NUCLEAR CHARGE 10.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 6.9334610 135.2710429 0 4.1140038 17.9440714 0 P1 TMS 7.2168166 29.4380813 0 7.1736962 58.8806749 0 3.0227988 4.9362827 0 2.8656990 9.7233521 0 P2 TMS 6.3215146 11.9072392 0 6.3914995 17.8595514 0 1.7697266 2.1991802 0 1.6367717 2.8935709 0 P3 TMS 4.2441984 -5.5093333 0 4.2291645 -7.3046417 0 ATOMIC NUMBER 53, NUCLEAR CHARGE 25.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 40.0333760 49.9896490 0 17.3005760 281.0065560 0 8.8517200 61.4167390 0 P1 TMS 15.7201410 67.4162390 0 15.2082220 134.8076960 0 8.2941860 14.5665480 0 7.7539490 28.9684220 0 P2 TMS 13.8177510 35.5387560 0 13.5878050 53.3397590 0 6.9476300 9.7164660 0 6.9600990 14.9775000 0 P3 TMS 18.5229500 -20.1766180 0 18.2510350 -26.0880770 0 7.5579010 -0.2204340 0 7.5974040 -0.2216460 0 ATOMIC NUMBER 55, NUCLEAR CHARGE 9.000, PSEUDOPOTENTIAL TYPE EXPONENT COEFF. N EXPONENT COEFF. N P0 TMS 4.0811192 84.5477223 0 2.4215224 16.6540350 0 P1 TMS 5.5339726 52.3496307 0 5.5067944 104.6994132 0 2.2809616 8.8065577 0 2.1034905 17.6166111 0 P2 TMS 1.8131494 5.2689855 0 1.8077217 7.9036419 0 0.8729040 1.3364313 0 0.8587203 2.0056513 0 P3 TMS 5.2170839 -16.4976543 0 5.1481965 -23.3081313 0 1.5805995 -2.2368273 0 1.3478959 -2.2269420 0 P4 TMS 1.8077398 -2.5041987 0 1.8050613 -3.1382445 0

    I hope this helps

  • Discuss tools and techniques for visualizing simulated data

    CRYSPLOT
    MOLDRAW
    CRYSTALClear
    Jmol/JSmol
    Others
    5 Topics
    19 Posts
    fbodoundefined

    Hi QMQDCHEM ,
    Could you share your BAND.DAT file so that I can do some quick test?
    Thanks

  • Communications for the community and updates on upcoming events

    Announcements
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    Share Your Work
    8 Topics
    10 Posts
    GiacomoAmbrogioundefined

    The Department of Chemistry and the Thomas Young Centre at Imperial College London 🇬🇧 and the Theoretical Chemistry Group of the University of Torino 🇮🇹, in collaboration with the Computational Materials Science Group of the Science and Technology Facilities Council (STFC), are organising the

    logo0.png

    MSSC2026 Summer School on Ab initio Modelling in Solid State Chemistry

    The School is designed for Master and Ph.D. students, as well as for post-docs and researchers who have an interest in getting or strengthening a background in:

    ⚛️ Computational Solid State Chemistry 🧠 Physics 🧱 Materials Science 🌐 Surface- and Nano-Science

    📅 The week-long School consists of morning lectures and afternoon hands-on tutorial sessions, where the formal framework and functionalities of the CRYSTAL electronic structure package will be explored.

    📌 While we strongly encourage in-person participation, we also offer the possibility to attend remotely through streaming of morning lectures and afternoon hands-on tutorials.

    📝 Participants will have the opportunity to present their research at a poster session.

    👉 You can register here!
    Friday 8 May - Deadline for payment of early bird fees.

    See the School website for further details.

Suggested Topics
  • Forum Rules

    Welcome to the official forum for CRYSTAL software users! This is a space to share knowledge, find support, and connect with others interested in solid-state simulations. To maintain a productive and respectful environment, we ask all members to adhere to the following rules...

  • CRYSTALClear

    CRYSTALClear is an open source project that provides an easy Python interface with CRYSTAL. The package allows you to quickly extract information from the CRYSTAL output files and to easily generate customizable plots...


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