###
### set_ppclass.txt
###
  # x-axis: possible names to search for. add in the line with a separating ;
  #
longitude;longi;Longitude;lon;XLONG;XLONG_M
  # y-axis: possible names to search for. add in the line with a separating ;
  #
latitude;lati;Latitude;lat;XLAT;XLAT_M
  # z-axis: possible names to search for. add in the line with a separating ;
  #
altitude;Alt;vert;presnivs;bottom_top;altitude_abg
  # t-axis: possible names to search for. add in the line with a separating ;
  #
Times;time;Time;time_counter;Ls
  # area: possible names to search for. add in the line with a separating ;
  #
area;aire
