Total QPE and quiescent emission L_X-T relation. The 0.2-2 keV X-ray luminosity is shown as a function of rest-frame temperature. The squares denote results from fits to the quiescent spectra only; the circles are from fits to the QPE spectra (not quiescence-subtracted). The same colour scheme as in Fig. B.1 is adopted, and black data points denote observations with no QPEs. All spectra are described using the same absorbed redshifted disc model (diskbb). The dashed (dotted) lines are best-fitting relations for the quiescence (QPEs) of the form L_X ∝ T^q resulting in q_quiesc ≃ 4.1 and q_QPEs ≃ 0.9.