The manual for the ASI385 shows a step improvement in read noise at a gain of 60. This is shown on a graph with a maximum value of 350. In both ASIStudio and Firecapture the maximum gain setting available is 600. In order to ensure that I work above the step improvement in read noise do I have to set the gain above 60 or a pro rata value of 103 ie 60x600/350?