Aggregate standard deviation normalized differences between the gain sample mean and the input gain values. For each PID t and detector i we calculate , where gⁱⁿ is the input gain, ḡ is the mean sample value and σ is the sample standard deviation. We then aggregate all of these values into the appropriate histogram. The red lines are ideal Gaussian distribution for comparison. Each subplot also lists the aggregate deviation from the expected mean of 0 within the error bounds.