Extinction map of Cha III derived from 2MASS in radio projection. The projection center is at (α,δ)_J2000 = (12^h42^m24^s,  − 79°43′48″). The contours start at A_V = 3 mag and increase by steps of 1.5 mag. The dotted lines are lines of constant right ascension. The angular resolution of the map (HPBW = 3′) is shown in the upper right corner. The five fields selected for mapping with LABOCA are delimited with dashed lines. The field of view of LABOCA is displayed in the lower right corner.