# doodson  name filename
# ----------------------
  055.565  om1  n/a                        # equillibrium tide
  056.554  sa   netcdf/SA_ocean_eot20.nc   # replaced by equillibrium tide
  057.555  ssa  netcdf/SSA_ocean_eot20.nc
  065.455  mm   netcdf/MM_ocean_eot20.nc
  075.555  mf   netcdf/MF_ocean_eot20.nc
  135.655  q1   netcdf/Q1_ocean_eot20.nc
  145.555  o1   netcdf/O1_ocean_eot20.nc
  163.555  p1   netcdf/P1_ocean_eot20.nc
  164.555  s1   netcdf/S1_ocean_eot20.nc
  165.555  k1   netcdf/K1_ocean_eot20.nc
  175.455  j1   netcdf/J1_ocean_eot20.nc
  235.755  2n2  netcdf/2N2_ocean_eot20.nc
  245.655  n2   netcdf/N2_ocean_eot20.nc
  255.555  m2   netcdf/M2_ocean_eot20.nc
  272.556  t2   netcdf/T2_ocean_eot20.nc
  273.555  s2   netcdf/S2_ocean_eot20.nc
  275.555  k2   netcdf/K2_ocean_eot20.nc
  455.555  m4   netcdf/M4_ocean_eot20.nc