| Bitpix |   | 96% | | 98% | 1 | 50 | 1 | 85 | 0 | 17 | 0 | 1 |
| Standard | | 99% | | 95% | 1 | 24 | 0 | 135 | 0 | 14 | 0 | 1 |
| ObservationDurationDescription | | 98% | | 50% | 1 | 10 | 0 | 22 | 0 | 9 | 0 | 1 |
| Compression | | 100% | | n/a | 0 | 10 | 0 | 38 | 0 | 10 | 0 | 1 |
| ObservationDescription | | 100% | | n/a | 0 | 8 | 0 | 31 | 0 | 8 | 0 | 1 |
| DataDescription | | 100% | | n/a | 0 | 8 | 0 | 31 | 0 | 8 | 0 | 1 |
| GenericKey | | 100% | | 96% | 1 | 21 | 0 | 44 | 0 | 5 | 0 | 1 |
| Synonyms | | 100% | | 100% | 0 | 12 | 0 | 21 | 0 | 6 | 0 | 1 |
| InstrumentDescription | | 100% | | n/a | 0 | 8 | 0 | 19 | 0 | 8 | 0 | 1 |
| IFitsHeader.SOURCE | | 100% | | n/a | 0 | 3 | 0 | 19 | 0 | 3 | 0 | 1 |
| IFitsHeader.HDU | | 100% | | n/a | 0 | 1 | 0 | 10 | 0 | 1 | 0 | 1 |
| NonStandard | | 100% | | n/a | 0 | 8 | 0 | 13 | 0 | 8 | 0 | 1 |
| HierarchicalGrouping | | 100% | | n/a | 0 | 8 | 0 | 13 | 0 | 8 | 0 | 1 |
| Checksum | | 100% | | n/a | 0 | 8 | 0 | 13 | 0 | 8 | 0 | 1 |
| FitsHeaderImpl | | 100% | | 100% | 0 | 8 | 0 | 17 | 0 | 7 | 0 | 1 |
| IFitsHeader.VALUE | | 100% | | n/a | 0 | 1 | 0 | 8 | 0 | 1 | 0 | 1 |
| StandardCommentReplacement | | 100% | | n/a | 0 | 6 | 0 | 15 | 0 | 6 | 0 | 1 |