fixes to PM4 #109

Job	Run time
run-notebooks (ubuntu-latest, PM1)	28s
run-notebooks (ubuntu-latest, PM2)	28s
run-notebooks (ubuntu-latest, PM3)	16s
run-notebooks (ubuntu-latest, PM4)	28s
run-notebooks (ubuntu-latest, PM5)	28s
run-notebooks (ubuntu-latest, CM1)	27s
run-notebooks (ubuntu-latest, CM2)	30s
run-notebooks (ubuntu-latest, CM3)	17s
run-notebooks (ubuntu-latest, AC1)	27s
run-notebooks (ubuntu-latest, AC2)	29s
run-notebooks (ubuntu-latest, T)	28s
run-notebooks (windows-latest, PM1)	13s
run-notebooks (windows-latest, PM2)	21s
run-notebooks (windows-latest, PM3)	22s
run-notebooks (windows-latest, PM4)	23s
run-notebooks (windows-latest, PM5)	23s
run-notebooks (windows-latest, CM1)	14s
run-notebooks (windows-latest, CM2)	12s
run-notebooks (windows-latest, CM3)	1s
run-notebooks (windows-latest, AC1)	23s
run-notebooks (windows-latest, AC2)	23s
run-notebooks (windows-latest, T)	23s
run-notebooks (macos-latest, PM1)	10s
run-notebooks (macos-latest, PM2)	1s
run-notebooks (macos-latest, PM3)	1s
run-notebooks (macos-latest, PM4)	1s
run-notebooks (macos-latest, PM5)	1s
run-notebooks (macos-latest, CM1)	32s
run-notebooks (macos-latest, CM2)	30s
run-notebooks (macos-latest, CM3)	2s
run-notebooks (macos-latest, AC1)	32s
run-notebooks (macos-latest, AC2)	31s
run-notebooks (macos-latest, T)	1s
	10m 26s

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