Looking to please get confirmation on whether one should add or subtract the STC from the PV's max temperature when calculating Vmin.

On the Victron MPPT calculator, it seems to use:

V_min = Voc * (1 + (PVmax_temp + STC) * (-V temp. coeff/100))

However everywhere else i research, it tells me to not add but subtract it as follows:

V_min = Voc * (1 + (PVmax_temp - STC) * (-V temp. coeff/100))