7-String Guitar Chord Chart and Tabs in drop L Tuning

BbM13, BbΔ13, Bb maj13
Notes: B♭, D, F, A, C, E♭, G
10,10,8,8,8,10,8 (2311141)
8,10,10,8,8,10,8 (1231141)
10,8,8,8,8,10,10 (2111134)
8,8,10,8,8,10,10 (1121134)