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star counts - Mariabs - 07-02-2012 19:59

can someone tell me how can I set the exact number of stars to be added with SkyMaker?
In Stellar field parameters:
STARCOUNT_ZP 3e4 # nb of stars /deg2 brighter than MAG_LIMITS
STARCOUNT_SLOPE 0.2 # slope of differential star counts (dexp/mag)

what does dexp/mag mean?