Automated MW calculations

[LFRodrigues]

Hi! I have two questions about the Molecular Weight button in ATSAS:
- As far as I understood it uses the I(0) value from Guinier analysis, right? But what if I want to use the I(0) calculated from the p(r) function? Is there a way of doing this?
- I still don't understand how to calculate the MW using water as standard here in this menu. I've that there's DATABSOLUTE for command line, but I don't understand the graphical interface here. What is the contrast field about?

Thanks in advance!

LF