S-Curve : why does pixel response probability go above 100% for GENX320 and not for IMX636 ?

S-Curve : why does pixel response probability go above 100% for GENX320 and not for IMX636 ?

Hello, 

I measured S-Curves for the IMX636 and the GENX320 and found that above a certain contrast value, pixel reponse probability values go above 100% for GENX320 and saturate at 100% for IMX636 . I saw you have a note on hot pixels for the GENX320. But except from from hot pixels and possibly the refractory period, what makes the pixel response probability of the IMX636 saturate at 100% and not for the GENX320  ? 

Cheers, 

Michael