| Command | Function |
|---|---|
| AVERAGE par1-par3 | computes average of images |
| AVERAGE/WEIGHT par1-par3 | computes average using normalized images |
| AVERAGE/WIN par1-par6 | average of images using only consistent pixel values |
| BIAS/CCD value catalog | Subtracts a bias value |
| COMPUTE/IMAGE | General image arithmetic |
| COMPUTE/WEIGHT | Computes weighting factors for the average functions AVERAGE/WINDOW and AVERAGE/WEIGHT |
| EXTRACT/CCD catalog | Removes irrelevant columns |
| MODIFY/COL par1-par3 | adjusts low-sensitivity CCD-columns |
| MODIFY/ROW par1-par2 | adjusts low-sensitivity rows |
| MODIFY/PIXEL par1-par5 | replaces areas with a surface |
| MODIFY/SKY par1-par5 | computes a constant sky-background |
=1 =5 =1990