### ARRAY section

There is one ARRAY (= receiver array description) section per frontend-backend combination and per baseband. The following list is for frontend-backend combination 1 and baseband 1 (the corresponding structure names for frontend-backend combination 2 were FEBE2%HEADER1 and FEBE2%DATA1, respectively FEBE2%HEADER2 and FEBE2%DATA2 for baseband 2, and so on).

ARRAY1 | S |  |
ARRAY1%HEADER1 | S |  |
ARRAY1%HEADER1%VSYS4R_2 | R | km/s | observer velocity in rest frame
ARRAY1%HEADER1%VSOU4R_2 | R | km/s | source velocity in rest frame
ARRAY1%HEADER1%SOBS4R_2 | C*8 | 'TOPOCENT' | observing frame
ARRAY1%HEADER1%SPEC4R_2 | C*8 | e.g. 'LSRK' | standard of rest frame for velocities
ARRAY1%HEADER1%CD4R_21 | D | km/s | velocity channel separation
ARRAY1%HEADER1%CUNI4R_2 | C*8 | 'km/s' | Unit
ARRAY1%HEADER1%CRVL4R_2 | D | km/s | velocity at reference channel
ARRAY1%HEADER1%CRPX4R_2 | R |  | reference channel
ARRAY1%HEADER1%CTYP4R_2 | C*8 | e.g. 'VARD-FRQ' | velocity axis for col.3
ARRAY1%HEADER1%WCSNM4R | C*8 | e.g. 'LsrkVRad' | axis name
ARRAY1%HEADER1%SOBS4F_2 | C*8 | 'TOPOCENT' | observing frame
ARRAY1%HEADER1%SPEC4F_2 | C*8 | e.g. 'LSRK' | standard of rest for frequencies
ARRAY1%HEADER1%CD4F_21 | D | Hz | channel separation
ARRAY1%HEADER1%CUNI4F_2 | C*8 | 'Hz' | Unit

ARRAY1%HEADER1%CRVL4F_2 | D | Hz | frequency at reference channel in
|  |  | rest frame
ARRAY1%HEADER1%CRPX4F_2 | R | Hz | reference channel.
ARRAY1%HEADER1%CTYP4F_2 | C*8 | 'FREQ-FRQ' | frequency axis for col. 3
ARRAY1%HEADER1%WCSNM4F | C*8 | e.g. 'LsrkFreq' | axis name
ARRAY1%HEADER1%CD3A_11 | I |  | pixel index separation = 1
ARRAY1%HEADER1%CRVL4_1 | I |  | pixel index value at this position = 1
ARRAY1%HEADER1%CRPX4_1 | I |  | ref. position = 1
ARRAY1%HEADER1%CTYP4_1 | C*8 | 'PIX-INDX' | Pixel/feed index in USEPIX array
ARRAY1%HEADER1%SBSEP | D | Hz | sideband separation
ARRAY1%HEADER1%SIDEBAND | C*3 |  | main sideband (USB or LSB)
ARRAY1%HEADER1%RESTFREQ | D | Hz | rest frequency of line (optional)
ARRAY1%HEADER1%TRANSITI | C*20 |  | main line transition (optional)
ARRAY1%HEADER1%MOLECULE | C*20 |  | main line molecule (optional)
ARRAY1%HEADER1%BANDWID | D | Hz | bandwidth for this band
ARRAY1%HEADER1%FREQRES | D | Hz | frequency resolution
ARRAY1%HEADER1%CHANNELS | I |  | number of channels for this baseband
ARRAY1%HEADER1%DATE_OBS | C*23 |  | observation start in TIMESYS system
ARRAY1%HEADER1%OBSNUM | I |  | observation number
ARRAY1%HEADER1%SCANNUM | I |  | scan number
ARRAY1%HEADER1%BASEBAND | I |  | baseband number
ARRAY1%HEADER1%FEBE | C*17 |  | frontend-backend combination ID

ARRAY1%DATA1%ISWITCH | C*4 |  | integration type
|  |  | NONE
|  |  | ON OFF
|  |  | LOAD SKY
|  |  | HOT COLD
|  |  | FHI FLO
ARRAY1%DATA1%MJD | D | day | MJD at integration midpoint
|  |  | in TIMESYS system
ARRAY1%DATA1%DATA | R |  | backend data