7-String Guitar Chord Chart and Tabs in Drop a Tuning

SibmM13, Sib-M13, Sib minmaj13
Notes: Si♭, Re♭, Fa, La, Do, Mi♭, Sol
10,9,8,8,8,10,8 (3211141)
8,9,10,8,8,10,8 (1231141)
10,8,8,8,8,10,9 (3111142)
8,8,10,8,8,10,9 (1131142)