---------------------------------------- Software Packages AIRY 7.2 known issues: ---------------------------------------- 1- The background estimation done by PRE module (and FSM module and ANB module for a star detection limit) can be contaminated by the object if the extension of the object is a large fraction of the image frame. The estimated mean value of the sky background and especially its rms value are then biased. SOLUTION: A simple solution is to compute directly the mean background using the routine n_phot (found in .../caos/lib/, help at the IDL/CAOS prompt with the command 'doc_library, "n_phot"'). For example, with a 0.01 arcsec px size, a telescope collecting surface of 10 m^2, an integration time of 100 s and an overall efficiency of 0.3, the K band mean background (per pixel) is: 0.3*(n_phot(0.,BAND="K",DELTA_T=100.,SURF=10.))[1]*0.01^2 Then it is necessary to enter by hand the value found within the PRE module GUI (using the option "consider a user-defined background"). 2- Stopping criteria (#2-#4) introduced in this version of AIRY (within the module DEC) may suddenly stop the iterations, therefore the saving procedure performed by the module WFT may fail. More precisely, if the restored object is saved at each given number of iterations, for example every 100 iterations, and the algorithm is stopped at the 455-th iteration, WFT will give an error. (PARTIAL) SOLUTION: If you are choosing stopping rule #2-#4, select "save image at the very end of the simulation" in the WFT module. ------------ compiled by: - Andrea La Camera (DIBRIS, USG, Genova, Italia) [andrea.lacamera@unige.it], - Marcel Carbillet (Lagrange, UCA, OCA, CNRS, Nice, France) [marcel.carbillet@unice.fr] last revision: 2017/11/24.