The EOHC file was designed to provide a complete contiguous time history of ISO telemetry without any of the time gaps of the EOHA file.
The EOHC file contains a primary header with the fields described in Table D.16. In this example non-mandatory fields are filled with example values.
| Keyword | Value | Description |
| SIMPLE = | T | / |
| BITPIX = | 8 | / |
| NAXIS = | 0 | / |
| EXTEND = | T | / |
| ORIGIN = | 'ESA ' | / European Space Agency |
| TELESCOP = | 'ISO ' | / Infrared Space Observatory |
| COMMENT | Continuous Executed Observation History | |
| FILENAME = | 'EOHC264 ' | / File name in ISO archive |
| DATE = | '09/07/95' | / Creation date |
| FILEVERS = | '0298 ' | / Version ID in ISO archive |
| OLPVERS = | 'OLP_21 ' | / SOC OLP system version |
| CALGVERS = | 'CALG_31 ' | / SOC OLP CAL-G files version |
| USERNAME = | 'PIPELINE' | / |
The EOHC file contains records described in Table D.17.
| Keyword | Number | Format | Description |
| EOHCTDTN | 1 | A6 | TDT number |
| EOHCUTCS | 1 | A11 | UTC start of observation (yydddhhmmss) |
| EOHCUTCE | 1 | A11 | UTC end of observation (yydddhhmmss) |
| EOHCINST | 1 | A1 | Prime instrument ID |
| EOHCNCPU | 1 | A1 | Obsolete column carried over from EOHA |
| EOHCRES | 1 | A14 | Reserved |
| EOHCAOTN | 1 | A4 | AOT name |
| EOHCPRID | 1 | A8 | Proposer ID |
| EOHCPLID | 1 | A8 | Proposal ID |
| EOHCOSN | 1 | A2 | Observation Sequence Number (OSN) |
| EOHCPSN | 1 | A2 | Obsolete column carried over from EOHA |
| EOHCPCAT | 1 | A1 | Proposal category |
| EOHCCIND | 1 | A1 | Calibration indicator |
| EOHCTNAM | 1 | A16 | Target name |
| EOHCSCAT | 1 | A3 | Scientific category |
| EOHCLIND | 1 | A2 | Link indicator |
| EOHCSPAR | 1 | A5 | Spare area within observation description |
EOHCAOTV |
1 | A64 | AOT/COT variable information (instrument specific) |