Spectral energy distribution of the MM1 core on ~5′′ scales. a) The black ° give the fluxes at each frequency, the blue × are the data used for the blackbody fit, note that at 23 and 25 GHz the free-free component has be subtracted. The black-body fit with and without the free-free component subtraction are given by the solid green and red dotted lines respectively. The magenta dot-dash line and hexagons, and cyan dashed line and diamonds give the radio fluxes and follows the free-free fits for MM1a and MM1b, respectively. The free-free emission data for MM1a and MM1b can be seen separated in b) and c). (Colour online.)