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Time: Instantaneous time saves exactly at the time specificedspecified. Average time saves at the end of the time period. For example a month average of January 1 to 31 will save at midnight on January 31.

Altitude: Vertical layers are sigma hybrid coordinates. You can convert into layer centers or edge pressures using the conversion factors (P0, hyam/hyai, hybm/hybi) combined with surface pressure. NCL has an example of converting hybrid to pressure coordinates:  The variable 'Z3' contains altitude in m.

Horizontal resolution: Latitude and longitude coordinates are saved and represent center values of the grid box.