****************************************
Short helpfile for action COORD_ANGLES
****************************************
The input trajectory can be in any of the following formats: 

                 CATOMS - all the angles between the bonds that radiate out from 
                          these central atom are computed. For more information on how to 
                          specify lists of atoms see \ref Group 
                  GROUP - a list of angls between pairs of bonds connecting one of 
                          the atoms specified using the CATOM command and two of the 
                          atoms specified here are computed. For more information on how to 
                          specify lists of atoms see \ref Group 

The following arguments are compulsory: 

                 SWITCH - the switching function specifies that only those bonds that 
                          have a length that is less than a certain threshold are 
                          considered 

In addition you may use the following options: 

                    SUM - ( default=off ) calculate the sum of all the quantities. 
                   MEAN - ( default=off ) calculate the mean of all the quantities. 
              LESS_THAN - calculate the number of variables that are less than a 
                          certain target value. 
              MORE_THAN - calculate the number of variables that are more than a 
                          certain target value. 
                BETWEEN - calculate the number of values that are within a certain 
                          range. These quantities are calculated using kernel density 
                          estimation as described on \ref histogrambead.. You can use multiple 
                          instances of this keyword i.e. BETWEEN1, BETWEEN2, BETWEEN3... 
              HISTOGRAM - calculate a discretized histogram of the distribution of 
                          values. This shortcut allows you to calculates NBIN quantites like 
                          BETWEEN. 


