updated instructions at top of script

reduction_tools/stream_select_cell.py

@@ -4,17 +4,17 @@
 
 """
 # aim
-randomly select a series of crystals from a stream file and
+selects crystals based on their unit cell values
-then compile them into the correctly formated .stream
 
 # usage
 python stream_random.py -s <path to stream>
                         -o output file names
-                        -n sample size
+                        -c tolerance of cell axes to accept
-                        -r how many repeat random samples do you want?
+                        -a tolerance of angles to accept
+                        -i ideal central lengths to accept
 
 # output
-.stream file with random sample of xtals
+.stream file containing images that fall within requested range of value
 """
 
 # modules