Correlations among photometric parameters in LRNe: ratio between blue and red peak optical luminosities versus the period during which the LRNe have luminosities in the range of 0.1L_peak and L_peak (top-left panel). The V-band absolute magnitude of the quiescent progenitor versus the V-band absolute magnitude of the brightest point during the slow pre-outburst phase (top-right panel), the V-band absolute magnitude of the first, blue peak (bottom-left panel), and the V-band absolute magnitude of the second, red peak (or the plateau) (bottom-right panel).