[mesa-users] Comparing OP_a09 vs. OP monochromatic track

[Ehsan Moravveji]

Dear MESA users,
I have computed two prototypical evolutionary tracks for a 7.5Msun star and Z=0.014 with Asplund et al. (2009) mixture, once setting 

    initial_zfracs = 6    
    kappa_file_prefix = ‘OP_a09'

and another time turning on the monochromatic opacity (Mono) computations instead of using tables. Nothing else is changed.
Mass loss and overshoot are also turned off, to make sure they do not intervene.
I have attached my inlist and my modified net (that includes all 17 OP elements). I use version 7678 and MESASDK.

I notice that there is a significant shift of the evolutionary track towards higher log_Teff when using the Mono opacities. The reason is that the OP Mono opacity profile in this model is systematically below what is retrieved from tables.
This surprises me, because the default OP_A09 table should (almost) mimic OP_a09 (with a difference that we need an interpolation in the latter case).

Has anyone seen this before?
Is there a way to fix this difference? Am I making any mistake here in my inlists?

Best regards
Ehsan.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: inlist_kap
Type: application/octet-stream
Size: 922 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20150731/19e69dbf/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: inlist_project
Type: application/octet-stream
Size: 3271 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20150731/19e69dbf/attachment-0001.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pp_cno_extras_and_OP_elements.net
Type: application/octet-stream
Size: 112 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20150731/19e69dbf/attachment-0002.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: kappa.png
Type: image/png
Size: 67088 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20150731/19e69dbf/attachment.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Mono-vs-OP_a09.png
Type: image/png
Size: 230536 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20150731/19e69dbf/attachment-0001.png>