Integrated intensity map of the HCO⁺ 4−3 line emission in the Orion Bar (see Goicoechea et al. 2016, for details on the mapped area). The contours corresponds to integrated intensities of 40 K km s⁻¹ (dashed) and 60 K km s⁻¹ (solid). The colors indicate intensities between 0 and 100 K km s⁻¹. The two circles in the lower left show the area of clumps with M = 0.01 M_⊙ (white) and M = 0.001 M_⊙ (gray).