The files that contains information on ephemeris and
valid antennas.
(1) Ephemeris data:
solar declination 
(in arc-degree),
hour angle (in time-sec), apparent solar radius (in arc-sec),
solar p-angle (in arc-degree),
solar b-angle (in arc-degree) at JST noon for previous,
present, next days.
(2) Valid antenna:
In the order of N01 - N28, E28 - E01, and W01 - W28.
0: use when synthesis, 1: unuse.
File name
sz00 YYMMDD001
Unit of storage
One file per one day
Directory
Anywhere. In NoRH archive, they are put under raw/steady. This file may be updated if some trouble on antennas is found later. In this case, the file will be put in data/sz_update.