docs: def get(self, col_str):
          '''
          get one data column with the data
  
          Parameters
          ----------
          col_str : string
              One of the column strings in self.cols.
  
          '''
          data_column=zeros(self.ilines)
          for i in range(self.ilines):
              data_column[i]=self.data[i][self.col_num[col_str]]
          return data_column