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The command determines the shutter error distribution. The error distribution is computed as follows. If $in\_frm1$ has a total reported exposure time of t1 seconds, and the shutter is opened and closed $n\_exp$ times (including the beginning and end of the exposure) and img2 has a total exposure time of t2 seconds, and the shutter is only opened and closed once, then the final shutter error frame $out\_frm$ is determined by:

\begin{displaymath}out\_frm = (in\_frm2*t1 - in\_frm2*t2)/(in\_frm1 - N*in\_frm2).
\end{displaymath} (27.1)

An image and a contour plot of the error frame are produced.

Petra Nass