@BeginModule
@Name      = Mastrfu
@Title     = Mass stream function
@Section   = Miscellaneous
@Arguments = ifile ofile
@Operators = mastrfu
@EndModule


@BeginOperator_mastrfu
@Title     = Mass stream function

@BeginDescription
This is a special operator for the post processing of the atmospheric 
general circulation model ECHAM. It computes the mass stream function 
(code number 272). The input dataset must be a zonal mean of v-velocity
(code number 132) on pressure levels.
@EndDescription
@EndOperator


@BeginExample
To compute the mass stream function from a zonal mean 
v-velocity dataset use:
@BeginVerbatim
   cdo mastrfu ifile ofile
@EndVerbatim
@EndExample
