The following is a list of header information contained in the SPC registers. These items can be examined with STATISTICS or EDIT, and plotted with XYPLOT. They are located just after the 8196 spectral channels in each register; the locations are listed below. A list of header locations can also be obtained on-line with the EDIT command.
Item Location Description Units
1 8197 Sequence number in original SPC file integer
2 8198 Feed angle (platform + RAB - 90) deg
3 8199 Q1: Velocity, centre channel km/s
4 8200 Q1: Velocity increment km/s
5 8201 Q1: Integration time s
6 8202 Q1: System temperature K
7 8203 Local sidereal time (LST) h
8 8204 Zenith angle deg
9 8205 Parallactic angle deg
10 8206 Declination or galactic latitude deg
11 8207 Right ascension or galactic longitude h or deg
12 8208 Q1: Number channels integer
13 8209 RAB's K-band polarimeter position angle deg
14 8210 Q1: System temperature of Reference K
15 8211 Focus platform position angle deg
16 8212 Observation date YYYYMMDD
17 8213 Telescope identification number integer
18 8214 Position angle (parallactic + feed) deg
19 8215 Gain (from CALIBRATE command) real
20 8216 Signal, Reference or Quotient integer
21 8217 Number of quadrants integer
22-25 8218-8221 Q1-Q4: Number channels integer
26-29 8222-8225 Q1-Q4: System temperature K
30-33 8226-8229 Q1-Q4: Bandwidth MHz
34-37 8230-8233 Q1-Q4: Integration time s
38-41 8234-8237 Q1-Q4: Velocity (channel 1) km/s
42-45 8238-8241 Q1-Q4: Velocity step km/s
46-49 8242-8245 Q1-Q4: Temperature of Cal K
50 8246 Focus position mm
51 8247 Q1: Frequency, channel 1 MHz
52 8248 Q1: Frequency increment MHz
53 8249 Equatorial (24) or galactic (360) h or deg
54-57 8250-8253 Q1-Q4: Frequency, centre channel MHz
58 8254 Stokes number of first quadrant integer
59 8255 UTC sec
60 8256 SPC register number integer
61 8257 Reference frame code integer
62 8258 Doppler shift applied real
63-64 8259-8260 reserved (blank)