Logarithm of comet C/2012 F6 (Lemmon) A(θ)fρ computed from UC, BC, GC, and RC narrowband continuum filters as a function of the logarithm of the heliocentric distance r (au). Pre-perihelion data are represented with filled symbols and post-perihelion data with open symbols. The origin of the x-axis is perihelion. Solid lines represent linear fits of the A(θ)fρ variation with the pre-perihelion heliocentric distance. Dotted lines are the same for post-perihelion values.