position of lower left corner of requested flatfield
image in the PIXCOORD system.
Validity range for both values is [1,2048] for both
parameter. (Integer)
xSize, ySize
size of requested flatfield image in x- and
y-direction. Units are subpixel. The maximum size is
2048 for both parameter. (Integer)
lambda
nominal wavelength of the flatfield. This parameter
is currently not used by the algorithm. (real)
