Fe Kα maps of the Sgr C complex for three periods of XMM-Newton observations (first three panels from the left) and Mopra HCN map integrated over the − 80 to − 60 km s⁻¹ velocity band for the same region (right panel). The yellow, green, and cyan dots give the position of the centroid of the emission in the C1 region in 2000−2001, 2006−2007 and 2012, respectively. A displacement of 1.6^′ of the emission in a direction similar to that of the molecular feature is visible. The Fe Kα maps are in units of ph cm⁻² s⁻¹ pixel⁻¹, with 2.5^″ pixel size, and smoothed using a Gaussian kernel of 8 pixels radius. The solid line region labelled Sgr C includes the bulk of the Fe Kα bright clumps, while the smaller regions reported by other papers plus the C4 clump newly labelled here are shown in dotted lines.