Guidelines:

Proceed as for a single pointing observation with AOT CAM01, but there are a few changes :

• Assuming natural unpolarized light, the transmission of a polarizer is 50 %, so that one must take = one half of the expected source flux.
• S/N stands for the Signal to Noise ratio in the averaged exposures obtained with one polarizer.
• The Table and the formula in section give the accuracy dP on the linear polarization ratio P, as a function of the S/N ratio of the measurements, and of the expected value of P.
• stands for the total number of elementary exposures taken on each polarizer during the observation. At each passage of a polarizer in the beam, 12 exposures are taken.