Best-fit spectral parameters with uncertainty intervals at the 68% confidence level on a single parameter and the reduced χ² fit statistics of the Crab pulsar and nebula ISGRI + JEM-X1 spectra averaged on a year-by-year basis; the first point refers to 2003 and the last point to 2018. The data extend from 3.5 to 20 keV for JEM-X and 20–300 keV for ISGRI. The model is a broken power law with break energies fixed at 20 and 100 keV; Γ₁₋₃ is the spectral index at increasing energies. We allowed the spectra to assume different normalisations through the flux parameter that we report for 5–20 keV (JEM-X1) and 20–100 keV (ISGRI). The resulting number of degrees of freedom is 55 before 2016 and 112 after 2016.