title: How to extract time series with NCO
body: <p>I have a single netcdf file with monthly precipitation data from 1998-2016. The extent of the file is (14.75,-90.5,15.75,-88.75) with a cell size of 0.25 by 0.25. So 8 columns and 5 rows. How can I make time series graphs using NCO for specific cells or for the whole extent? </p>