L_CII-SFR and Σ_[CII]-Σ_SFR relations for the galaxy COS2987 and its minor components. Upper-left panel: [C II] moment-0 map with the regions considered as the whole system of COS2987 and its substructures highlighted as a yellow dashed circle and red circles, respectively. The regions within COS2987 are number as displayed in the figure. The dashed-dotted white line shows the 2-σ significance level of the galaxy. Bottom-left panel: F125W-band map with the same regions displayed in the upper left panel. The 2-σ significance level of the [C II] moment-0 map is shown as a black dashed-dotted line. Upper-right panel: L_CII-SFR relation. The single system of COS2987 and its substructures are displaced as a purple diamond and thin green/white diamond, respectively. As a reference, the single system and their corresponding substructures of galaxies at z = 5 − 6 are represented as red circles and orange stars, similarly as the original study (Carniani et al. 2018a). Normal star-forming galaxies from the ALPINE survey (Schaerer et al. 2020) are represented as black circles. The black solid line and filled area describes the best-fit for the distribution of galaxies at z ∼ 0 (De Looze et al. 2014). Bottom-right panel: Σ_[CII]-Σ_SFR relation. The lines and points are the same from the upper right panel, except for the black solid line and filled area that corresponds to the local Σ_[CII]-Σ_SFR relation by Herrera-Camus et al. 2015. The dashed black line represents the best-fit for the galaxies and its respective clumps (Carniani et al. 2018a).