7.5.8 EXP_NORM

EXP_NORM takes a data array and produces an exposure and summation mode normalized floating point array. Note the floating array takes four times more room so don't use too big an array to start with. You need to give it an index array - make sure that the two correspond exactly or else the results will be meaningless. To run it, type:
IDL> ndat = exp_norm(data,index)
 
IDL> ndat = exp_norm(data,index,0)
To do this it follows the following steps:

• decompresses the data array
• subtracts background
• divides by the exposure time
• divides by the number of pixels binned