docs: def get(self,str_name):
          """
          return a column of data with the name str_name.
  
          Parameters
          ----------
          str_name : string
              Is the name of the column as printed in the
              profilennn.data or lognnn.data file; get the available
              columns from self.cols (where you replace self with the
              name of your instance)
  
          """
  
          column_array = self.data[:,self.cols[str_name]-1].astype('float')
          return column_array