Zoom-in of the central region at t = 170 Myr. The small green cross shows the position of Cluster-3. The left panel shows the [C II] luminosity, the middle panel the FIR luminosity (both in units of L _⊙), and the right panel their ratio. The L _CII > 0.5 L _⊙ criterion has been applied to obtain this ratio. The dashed circles centered to the position of Cluster-3 show the radial distances of 0.1, 0.2, and 0.3 kpc. The inner 0.2 kpc region is [C II] deficient owing to the presence of a strong FUV radiation field emitted from the massive Cluster-3, which increases abruptly the FIR emission while [C II] becomes thermally saturated.