Comet parameter: override_charge
         
         - This parameter specifies whether or not to override existing precursor
         charge state information when present in the files with the charge
         range specified by the
         "precursor_charge" parameter.
         
- Valid values are 0, 1, 2, and 3:
            
            - 0 = keep any known precursor charge state values in the input files
            
- 1 = ignore known precursor charge state values in the input files 
                and instead use the charge state range specified by the
                "precursor_charge" parameter
            
- 2 = only search precursor charge state values that are within the
                range specified by the 
                "precursor_charge" parameter
            
- 3 = keep any known precursor charge state values. For unknown
                charge states, search as singly charged if there is no
                signal above the precursor m/z or use the
                "precursor_charge" range otherwise.
            
 
Example:
         
override_charge = 0
         
override_charge = 1
         
override_charge = 2
         
override_charge = 3