Spectral energy distribution (SED) of CB 26. The red squares and green dots with error bars represent the observational data (Table 1). The dashed black line shows our best-fit model SED. The dashed-dotted blue line represents the adopted contribution from free-free emission. The dotted red line correspondsto the sum flux of dust and free-free emission between 2.9 mm and 4.0 cm. The jump in the SED at ~10³ μm is due to the transition from total flux measurements at shorter wavelengths to interferometric data at longer wavelengths, which do not recover the total flux from the extended envelope emission.