Ratio of published mass-loss rates derived from observations using analysis that neglects clumping (Ṁ_lit), and mass-loss rates predicted using Eq. (3), plotted as a function of effective temperature T_eff for B supergiants. The observations include Balmer line (mostly Hα) mass-loss rates of Galactic B supergiants (Kudritzki et al. 1999; Crowther et al. 2006; Lefever et al. 2007; Markova & Puls 2008; Haucke et al. 2018, red plus symbols), Hα mass-loss rates of B supergiants from the Small Magellanic Cloud (Evans et al. 2004; Trundle et al. 2004; Trundle & Lennon 2005, red triangles) scaled according to Ṁ ~ Z^0.59 (Krtička& Kubát 2018), and mass-loss rates from radio data (Scuderi et al. 1998; Benaglia et al. 2007, violet squares). The ratios of the predictions of Vink et al. (2001) to our predictions for three different luminosities are overplotted (solid gray lines). Plotted with v∕v_esc = 2 for T_eff ≥ 20 kK and with v∕v_esc = 1.3 for T_eff ≤ 20 kK.