Loading Non-polarization Data

For observations with single receiver system, the original SMA data file will be loaded into Miriad in two separated files: gc_rx1.lsb and gc_rx1.usb for the lower and upper side bands, respectively. In calibration, the lsb and usb data sets are treated separately. For continuum imaging, both calibrated lsb and usb can be merged in the imaging process.

smalod% inp
  Task:   smalod
  in       = /sma/data/040329_09:37:37/  % import raw data in
                                           SMA archival format.
  out      = gc                          % prefix of output file
                                           name in MIRIAD format.
  rxif     = 1                           % rx/if id =1
  sideband = 2                           % lower side band.
  nscans   = 35,950                      % skip the first 35
                                           integration scans.
                                         % and load the next
                                           950 scans.

smalod% inp
  Task:   smalod
  in       = /sma/data/040329_09:37:37/  % import raw data in 
                                           SMA archival format.
  out      = gc                          % prefix of output file 
                                           name in MIRIAD format.
  rxif     = 1                           % rx/if id =1
  sideband = 0                           % lower side band.
  nscans   = 35,950                      % skip the first 35 
                                           integration scans.
                                         % and load the next 
                                           950 scans.

For observations with dual receiver system, selection above will load only the lower side band data of one receiver (with a receiver id=1) from the original SMA data file. A total of 4 seperated files will be splitted from a raw SMA data file observed with a dual receiver system. Miriad supports calibration of the splitted data based on each of frequency bands.

Since the version 1.15 11-Oct-05 or a later version, smalod has been implemented with a function of reading the online flagging information by default. In addition, in case of the corrupted baseline vectors in the SMA data header which is used to decode the antenna positions of the array, there is an input Keyword: readant which allows users to read the ASCII file 'antennas' in the SMA file data directory if readant=8 or larger number is specified. Here is an exmaple of the usage:

smalod in=050911_04:21:35 out=050911H30a rxif=0 \
       sideband=1 nscans=5, readant=8

Note that for the data taken from 4 GHz mode, smalod reads the antenna positions directly from the ASCII file 'antennas'.