Cut 'N Paste
- global average:     aave($v,g)*($v)/($v)
- zonal mean:          ave($v,lon=0,lon=360)
- pratesfc freq:     100*ave(const(pratesfc/pratesfc,0,-u),t=1,t=124)
- prate freq:     100*ave(const(prate/prate,0,-u),t=1,t=124)
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