"They (ZWO) have a graph for each camera showing the relationship between the gain number you set in the camera driver, and the actual gain in e-/ADU"
I need the location of this graph, please. Or a source of similar information.
you find this information in the user manual of ZWO's cameras.
That comes with the camera, or can be downloaded from ZWO's homepage.
E.g. you find that information for the ASI1600 on page 9:https://astronomy-imaging-camera.com/ma ... l%20EN.pdf