Photon collision rates could not be calculated?

[zhong]

Hi
I want to use Garfield++ to simulate some gas files
The gas parameters are set like this,

• This prompt appears when running the file,But the program can continue to run
  

I would like to ask how to solve such a problem
looking forward to your reply

[hschindl]

Hi,
the message is harmless. A long time ago I played a bit with including photon transport in the avalanche simulation, and for that purpose I implemented photon cross-section tables for a few gases. But this whole thing never went beyond the experimental stage.
The message just means that there are no photon cross-section data available for this gas mixture, but it doesn’t matter at all because by default they are not used anywhere in the program.
I probably should just remove the message.

[zhong]

Thanks a lot for your help.
Since this message is harmless, I’m going to go ahead and calculate it