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A double selective series (a)ii and (b)ii of dI/dV spectra recorded on a Pb(111) sample non grounded when both STM Tip A and Tip B are in tunnelling conditions. For reference, the (a)i and (b)i spectra have been recorded on Tip A and Tip B with the sample grounded. The α and β parameters are obtained by fitting the (a)ii and (b)ii spectra to the (a)i and (b)i dI/dV spectra recorded independently on the Tip A and Tip B dedicated lock-in when the sample was grounded. This fitting leads to the series (a)iii and (b)iii also perfectly superposed on (a)iv and (b)iv. VA-S = (VA − VS) the voltage difference between Tip A and the sample holder floating (see Fig. 2a), V B-S = (VS − VB) between Tip B and the sample holder floating and VA-B = (VA − VB) between Tip A and Tip B. VA-GS and VB-GS are the Tip A and Tip B bias voltage when the sample holder is grounded (GS).
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