Distribution of the final clean sample of the secure star-forming HEC-eR1 galaxies in the main sequence plane. In both panels, stars indicate the galaxies with reliable X-ray flux measurements, and the dots the galaxies with uncertain fluxes. The colour-code in the top panel corresponds to the log(D), while in the bottom panel corresponds to the gas-phase metallicity, 12+log(O/H). The diagonal dashed lines indicate three different sSFR values (i.e. sSFR: 10⁻⁹, 10⁻¹⁰, and 10⁻¹¹ M_⊙ yr⁻¹/M_⊙). The orange solid line shows the main sequence of the star-forming galaxies from Renzini & Peng (2015). Our final sample is well distributed along the SFR-M_⋆ plane covering a wide range of distances and gas-phase metallicities.