title: Not able to append two netcdf files using nco
body: <p>I am using netcdf operators to append two NCEP netCDF files together.
  These files are of different sizes but they represent the same atmospheric variable i.e. geopotential height. One is at 1000 hPa and the other file is at 925 hPa.They have the same dimensions and same latitudinal and longitudinal extent. Both represent the same time instant</p>
  
  <p>This is the command I am using - <strong>ncks -A hgt_1000.nc hgt_925.nc</strong></p>
  
  <p>The command runs without any issue but when I look at the output of hgt_925.nc it looks the files have not merged. Looking at the NCO documentation it looks they have to be the same size to append. Is there another way forward or should I write my own code to append ? These are netCDF4 files classic files downloaded using nccopy.</p>