+------------------------------------------------------------------------------+
|                                                                              |
| Digital Numbers                                                              |
|        |                                                                     |
|  +-----v-----+                                                               |
|  |  i.*.toar | ---> Reflectance                                              |
|  +-----+-----+     (uncorrected)~~~(DOS methods)--+                          |
|        |                 +                        |                          |
|    (-r flag)         (-r flag)                    +--> "Corrected"           |
|        |                 |                        |     Reflectance          |
|        v           +-----v----+                   |                          |
|     Radiance ------> i.atcorr +-------------------+                          |
|                    +----------+                                              |
|                                                                        ;-)   |
+------------------------------------------------------------------------------+