Top: long-term evolution of the observed flux and of the luminosities of the BB and soft PL spectral components of 1E 1547.0–5408 between 2008 October 3 and 2019 February 15. Bottom: long-term evolution of the soft X-ray luminosity of 1E 1547.0–5408 between 2004 February 8 and 2019 February 15. The values derived from Chandra and XMM–Newton observations are taken from Coti Zelati et al. (2018). All quantities are evaluated over the 0.3–10 keV energy band. Luminosities have been estimated following the same procedure outlined in Table 1. The luminosities in the time interval between 2013 and 2017 are consistent with those measured after 2017, and are not shown for plotting purpose.