fix Raman gain estimation during design #266

Job	Run time
Tests on paywalled platforms	0s
Tests on other platforms (windows-2019, 3.10)	2m 28s
Tox test (py38)	1m 53s
Tests on other platforms (windows-2022, 3.11)	2m 13s
Tox test (py39)	1m 52s
Tests on other platforms (windows-2022, 3.12)	2m 49s
Tox test (py310)	1m 55s
Tests on other platforms (macos-12, 3.11)	2m 27s
Tox test (py311)	1m 51s
Tests on other platforms (macos-13, 3.12)	1m 55s
Tox test (py312-cover)	2m 43s
Tox test (docs, graphviz)	2m 3s
PyPI packaging	0s
Docker image	0s
	24m 9s

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