There are two kinds of formats for Nobeyama Radio Polarimeters (NoRP). One is before unifing with Toyokawa Radio Polarimeters and the other is after that. For older format, the files include only 1, 2, 3.75 9.4 GHz data.
In order to read the data into IDL session, give the date (JST) as follows:
IDL> day='1991-1-25'
IDL> norp_rd_dat,day,mvd,tim,fi,fv,freq 
CR
or give the file name as follows:
IDL> file='/archive/pub/norp/raw/1991/01/pl910125'
IDL> norp_rd_dat,file,mvd,tim,fi,fv,freq CR
freq is observing frequencies in units of GHz
(in this example, 1, 2, 3.75, 9.4, 17, 3, 80 GHz), tim is
observing time, fi,fv are I (R+L), V (R-L)
comonents of flux density,
respectively. mvd is an array including the values of unity (1) for
valid data or zero (0) for non-valid data.
In order to read the data in specified duration:
IDL> timerange=['1991-1-25 2:00','1991-1-25 4:00'] CR
IDL> norp_rd_dat,day,mvd,tim,fi,fv,freq,timerange=timerange CR
In order to read the data of specified frequency, e.g. for 17 GHz,
IDL> rdfreq=[0,0,0,0,1,0,0] CR
IDL> norp_rd_dat,day,mvd,tim,fi,fv,rdfreq=rdfreq CR
For 1GHz and 9.4GHz,
IDL> rdfreq=[1,0,0,1,0,0,0] CR
IDL> norp_rd_dat,day,mvd,tim,fi,fv,rdfreq=rdfreq CR
Each element in the array rdfreq corresponds to the data of
one frequency among 1, 2, 3.75, 9.4, 17, 35 and 80 GHz.