Filled circles are the mean fit error, and the open circles are the standard deviation around the mean. The data itself is table to ust a couple tenths of a percent. As expected, the two are nearly identical. Up until this time we have not had data capable of differentiating between these models. However, it is also apparent that the curve being used is incorrect.
Open circles are data, the line is the linear component derived via quadratic method.
At right is a typical image of the lamps in channel 4. 5 - Relative error for all pixels in chan. 5b - Relative error for binned Ch.4 input based on quadratic method. Filled circles are the mean fit error, and the open circles are the standard deviation around the mean. On this page you can see several alternatives.