Diagram showing L_p versus FWHM_min for the Fermi/GBM divided into nine redshift bins with equal logarithmic spacing in luminosity distance. The blue dots represent merger-candidates (or Type-I GRBs), and red dots represent collapsar-candidates (or Type-II GRBs). The dashed cyan lines show 90% and 50% detection efficiency (vertical bars). Gold dashed lines indicate regions of constant isotropic-equivalent released energy (in erg) for each peak, roughly calculated as $E_{\mathrm{iso}}=L_p\times {\mathrm{FWHM}}_{\min }$.