C7♭13 8-string bass chord

How to play C7♭13 on 8-string bass

The most common way, the first shape above: your middle finger on the A string at the 3rd fret, your index finger on the D string at the 2nd fret, your ring finger on the G string at the 3rd fret and your little finger on the F string at the 3rd fret. Let the C string ring open. Don’t play the F♯, B and E strings.

From the F♯ string x x x 3 2 3 0 3 (x: not played, 0: open)

What notes are in C7♭13?

C7♭13, C dominant seventh flat thirteen, is C, E, G, B♭ and A♭: the root (C), the major third (E), the perfect fifth (G), the minor seventh (B♭) and the flat thirteenth (A♭). Its formula is 1 3 5 ♭7 ♭13.