[Comm2011] flats with covered aux filters

[Muschielok Bernard]

Dear All:

I made the exercise with blocking light going through auxiliary for two 
other filters with different auxiliary and science i.e. z' and v 
Stroemgren.

The images for z' are:
OMEGACAM_IMG_FLAT216_0027.fits (aux covered) and 
OMEGACAM_IMG_FLAT216_0028.fits (aux not covered)

and

for v Stroemgren:
OMEGACAM_IMG_FLAT216_0029.fits (aux covered)
OMEGACAM_IMG_FLAT216_0030.fits (aux not covered)

The orientation of covered auxiliary filter in respect to the science 
mosaic is the same for z' and v Stroemgren as well as for u' made 2 days 
ago.

I have measured the intensity in the centre of the CCDs being next to the 
auxiliary filters. For z' the effect is small 1 - 2%, for v Stroemgren it 
is about 5%.

Kind regards,

Bernard