class_docstr: NWCSAF PPS&MSG NetCDF reader.
code: def _adjust_variable_for_legacy_software(self, variable):
      if (
          self.sw_version == "NWC/PPS version v2014"
          and variable.attrs.get("standard_name")
          == "cloud_top_altitude"
      ):
          # pps 2014 valid range and palette don't match
          variable.attrs["valid_range"] = (0.0, 9000.0)
      if (
          self.sw_version == "NWC/PPS version v2014"
          and variable.attrs.get("long_name")
          == "RGB Palette for ctth_alti"
      ):
          # pps 2014 palette has the nodata color (black) first
          variable = variable[1:, :]
      return variable
  
imports: import functools
  import logging
  import os
  from contextlib import suppress
  from datetime import datetime
  import dask.array
  import numpy
  import xarray
  from pyproj import CRS
  from pyresample.geometry import AreaDefinition
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.readers.utils import unzip_file
  from satpy.utils import get_chunk_size_limit
label_desc: Use image node_id 12 for calling the NcNWCSAF obj's underlying member method code with example usage: obj._adjust_variable_for_legacy_software(variable) and returns: variable