old_contents: import pandas as pd
  
  from monitorframe.monitor import BaseDataModel
  
  from cosmo.filesystem import FileDataFinder
  from cosmo import FILES_SOURCE
  from cosmo.monitor_helpers import explode_df
  
  
  class OSMDataModel(BaseDataModel):
  
      def get_data(self):
          header_keys = (
              'ROOTNAME', 'EXPSTART', 'DETECTOR', 'LIFE_ADJ', 'OPT_ELEM', 'CENWAVE', 'FPPOS', 'PROPOSID', 'OBSET_ID'
          )
          header_extensions = (0, 1, 0, 0, 0, 0, 0, 0, 0)
  
          data_keys = ('TIME', 'SHIFT_DISP', 'SHIFT_XDISP', 'SEGMENT')
          data_extensions = (1, 1, 1, 1)
  
          finder = FileDataFinder(
              FILES_SOURCE,
              '*lampflash*',
              header_keys,
              header_extensions,
              data_keys=data_keys,
              data_extensions=data_extensions
          )
  
          df = pd.DataFrame(finder.data_from_files())
  
          return explode_df(df, list(data_keys))
  
new_contents: import pandas as pd
  
  from monitorframe.monitor import BaseDataModel
  
  from cosmo.filesystem import FileDataFinder
  from cosmo import FILES_SOURCE
  from cosmo.monitor_helpers import explode_df
  
  
  class OSMDataModel(BaseDataModel):
      """Data model for all OSM Shift monitors."""
  
      def get_data(self):
          header_keys = (
              'ROOTNAME', 'EXPSTART', 'DETECTOR', 'LIFE_ADJ', 'OPT_ELEM', 'CENWAVE', 'FPPOS', 'PROPOSID', 'OBSET_ID'
          )
          header_extensions = (0, 1, 0, 0, 0, 0, 0, 0, 0)
  
          data_keys = ('TIME', 'SHIFT_DISP', 'SHIFT_XDISP', 'SEGMENT')
          data_extensions = (1, 1, 1, 1)
  
          # Find data from lampflash files
          finder = FileDataFinder(
              FILES_SOURCE,
              '*lampflash*',
              header_keys,
              header_extensions,
              data_keys=data_keys,
              data_extensions=data_extensions
          )
  
          df = pd.DataFrame(finder.data_from_files())
  
          return explode_df(df, list(data_keys))
  
subject: Add comments and docstring to OSMDataModel