WIP: Fitting for wideband datasets in the presence of correlated noise #4731

Job	Run time
macos-latest-py313	1h 6m 2s
ubuntu-latest, ephemeris_connection	1m 6s
ubuntu-latest, black	26s
ubuntu-latest, py313-test-cov	58m 54s
ubuntu-latest, notebooks	4m 48s
ubuntu-latest, oldestdeps	29m 12s
	2h 40m 28s

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