fix(csub): CSUB observations #3658

Job	Run time
Check format	1m 50s
Check format	2m 5s
Build	1m 47s
Build	1m 39s
Smoke test	5m 52s
Smoke test	5m 59s
Test Intel fortran (ubuntu-22.04)	26m 56s
Test Intel fortran (ubuntu-22.04)	39m 11s
Test GNU fortran (macos-13, false)	26m 19s
Test GNU fortran (macos-13, false)	43m 12s
Extended testing (ubuntu-22.04)	18m 45s
Extended testing (ubuntu-22.04)	17m 56s
Test Intel fortran (macos-13)	27m 49s
Test Intel fortran (macos-13)	45m 43s
Test GNU fortran (macos-14, false)	17m 49s
Test GNU fortran (macos-14, false)	26m 43s
Test Intel fortran (windows-2022)	33m 45s
Test Intel fortran (windows-2022)	1h 5m 37s
Extended testing (macos-13)	42m 7s
Extended testing (macos-13)	1h 9m 18s
Test GNU fortran (macos-14, true)	32m 44s
Test GNU fortran (macos-14, true)	1h 0m 21s
Extended testing (windows-2022)	54m 2s
Extended testing (windows-2022)	1h 48m 34s
Test GNU fortran (ubuntu-22.04, false)	22m 1s
Test GNU fortran (ubuntu-22.04, false)	31m 46s
Test GNU fortran (ubuntu-22.04, true)	46m 52s
Test GNU fortran (ubuntu-22.04, true)	1h 25m 56s
Test GNU fortran (windows-2022, false)	32m 22s
Test GNU fortran (windows-2022, false)	44m 31s
	17h 19m 31s

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