%% Extended stability diagram 1
V_P1: Voltage applied to gate P1, in mV.
V_P2: Voltage applied to gate P2, in mV.
S21: Charge sensor signal, corresponding to the charge states in the P1/P2 double dot, in arbitrary units.

%% Extended stability diagram 2
V_P1: Voltage applied to gate P1, in mV.
V_P2: Voltage applied to gate P2, in mV.
dS21: Derivative charge sensor signal: abs(nabla(S_21)), showing the addition lines of the P1/P2 double dot, in arbitrary units.