Which filter to use to fetch precipitation data from nomad website?

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I want to fetch precipitation data from nomad Website but I don't know which grib filter to use to fetch only preicipation data, can someone tell me which filters to use.

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Try to download only 'PRATE' variable for only 'surface' level. Here is the url:

http://nomads.ncep.noaa.gov/cgi-bin/filter_gfs_1p00.pl?file=gfs.t00z.pgrb2.1p00.f003&lev_surface=on&var_PRATE=on&leftlon=0&rightlon=360&toplat=90&bottomlat=-90&dir=%2Fgfs.2018070400

I get a grib file of 274kb.

Hope this helps