These arrangements are for the Standard G Dobro tuning with string #6 tuned up from G to E. This gives us both a G chord on strings 1 -5 and an an Emin and Emin 7th chord on Strings 6-3.  For more about the tuning, you can read Greg’ Booth’s description and advice here: https://squareneckjournal.com/2015/02/08/explore-drop-e-tuning-by-greg-booth/

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G/Em Tuning (low to high) E  B  D  G  B  D