How to get the IonMobility.txt file ? if the /garfield/Data/ don't have one

The gas i used is n-pentane and Co2. but i con’t generate it?

Hi,

Welcome to the ROOT community.
Your question still has no answer since it is not related to ROOT. I hope you can contact a Garfield expert or consult a knowledge base to learn more about this issue.

Best,
D