[Freesurfer] mris_make_template needing .H file

Hi experts,

I have tried this syntax for making a surface template: mris_make template ?h sphere subj1 subj2 subj3 my_template.tiff

Output is an error saying "Could not read curvature file: ?h.infalted.H"

But searching in the /surf directory for .H file, I have added "-infname white_avg" to the command and it seems to run smoothly. My question is, what is this .H file? Should I safely ignore the default search for inflated.H and keep on using white_avg.H instead? Also, the make_average_surface command gives the same "missing .H file" error but this time there is no -infname parameter to be manipulated.

Thanks in advance, Sourena