Cell number convention

[ManonPetit]

Hello,
I am using bifacialvf to model a single axis tracker and study the backside irradiance dsitribution.,
For this, I need 20 measurement points along the module chord to compare with my measurements.

When I run bifacialvf, the results file includes backside irradiance values numbered from 1 to 20, but I do not understand what is the convention.
Are the number ordered from West to east? Or is there another way of ordering them?

Thank you for your help !
Manon

[cdeline]

This could be annotated in the documentation to be more clear.