Comparison of the SED of MWC 314 and LBV P Cygni reveals very similar slopes (dash-dotted and dotted lines) of the near-IR and IR flux density in these early B-type Ia supergiants. Broadband photometric observations (solid black dots), including from five space missions (open and solid triangles, open and solid boxes, and open pentagonal symbols), are compared to Spitzer and ISO spectra (solid drawn line with spikes, red in online version).The sub-panel in the right-hand panel compares the slopes of the Spitzer spectrum of MWC 314 (upper curve) with the ISO and Spitzer spectra of P Cyg (see text). The observed IR flux excesses compared to the photospheric continuum fluxes (smoothly drawn solid lines) are caused by free-free emission in an expanding stellar wind.
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