Lyman continuum flux as a function of heliocentric distance. The red and blue circles represent 6 cm radio continuum sources associated with and without mm-RRL sources. The gray area is filled between Lyman continuum fluxes estimated with median 6 cm integrated fluxes of radio sources associated with and without mm-RRL. The red and blue dot-dashed lines show median values in the Lyman continuum flux distributions for those sources, respectively.