Data is recorded in the matlab4 data format and consists of several blocks:

• the experiment info, d_ExpInfo (ASCII string)
• the antenna parameters (see below), d_parbl (32 bit reals)
• the data, d_data (2×32 bit complex reals)
• the raw samples (not always present), d_raw (216 bit complex integers)
• Bit 65-74 is different depending on system
• Antenna ID parameter 41:
  1 32m ESR
  2 42m ESR
  3 VHF
  4 UHF
  5 Kiruna
  6 Sodankylä
  8 32p ESR
• ESR parameter 67
  0 SPEAR all tx off
  1 SPEAR low power radar
  2 SPEAR high power radar
  3 SPEAR heating
• ESR parameter 68

0 Lower plasma line LO1 set to 492 MHz and upper plasma line LO1 to 502 MHz
1 Lower plasma line LO1 set to 496 MHz and upper plasma line LO1 to 502 MHz
2 Lower plasma line LO1 set to 492 MHz and upper plasma line LO1 to 506 MHz
3 Lower plasma line LO1 set to 496 MHz and upper plasma line LO1 to 506 MHz

• UHF parameter 67 (not available at UHF remotes) and VHF parameter 72 gives the power status on the Tromsø¸ systems as follow:
  Bit 0 UHF RF on
  Bit 1 UHF HV on
  Bit 2 UHF power on
  Bit 3 VHF RF on
  Bit 4 VHF HV on
  Bit 5 VHF power on
  Bit 6 Heating RF on
  Bit 7 Heating power on
• VHF parameter 69 are decoded as follows:
  bit 0:1 Antenna phasing
  0 allB
  2 allA
  3 splitbit 2:5 IF setup
  bit 2 lo1/chI  0 298 MHz 1 290 MHz
  bit 3 lo1/chII 0 298 MHz 1 290 MHz
  bit 4 lo2/chI  0 84 MHz 1 78 MHz
  bit 5 lo2/chII 0 84 MHz 1 78 MHzPositive logic Note these values are integers