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The phase diagram of the superconducting cuprates is often used to show howtheir electronic properties change as a function of the mean doping level,i.e., the average hole content of the CuO$_2$ plane. In Nuclear MagneticResonance (NMR) experiments average doping, as well as the distribution ofthese holes between planar Cu and O reveals itself through the quadrupolesplittings of the $^{63,65}$Cu and $^{17}$O NMR. Here we argue based on allpublished NMR data available to us in favor a new type of phase diagram thathas the planar oxygen quadrupole splitting and with it the planar oxygen holecontent as abscissa rather than the average hole content of the CuO$_2$ plane.In such a plot the superconducting domes of the different cuprate families areshifted horizontally according to their maximum critical temperature $T_{\rmc,max}$ set by the chemistry of the parent material, which determines itsoxygen hole content. The higher the O hole content the higher $T_{\rm c,max}$that can be achieved by actual doping. These findings also offer a strategy forfinding cuprates with higher $T_{\rm c,max}$.

Phase diagram of hole-doped cuprates based on $^{17}$O and $^{63}$Cu NMR quadrupole splittings