Offset from the MS of star formation (Popesso et al. 2023) as a function of redshift. The grey region represents 0.5 dex scatter around the MS. Filled stars show the CO-emitters in G073 with a stellar mass estimate (red are those with z < 2 and magenta those with z > 2). Coloured triangles represent CO-detected cluster and protocluster members from the literature at 1.4 < z < 2.65: XCS J2215 at z = 1.46 from Hayashi et al. (2018); COSMOS 1002+0134 at z = 1.55 from Aravena et al. (2012); SpARCS J022546−035517 at z  =  1.59 from Noble et al. (2019); SpARCS J033057−284300 at z  =  1.613 from Noble et al. (2017); CLG J0218−0510 at z  =  1.613 from Rudnick et al. (2017); SpARCS J022426−032330 at z  =  1.613 from Noble et al. (2017); J1030+0524 at z  =  1.694 from D’Amato et al. (2020, 2021); SpARCS1049+56 at z  =  1.710 from Webb et al. (2015); ClJ1449+0856 at z  =  1.990 from Coogan et al. (2018); MRC1138−262 at z  =  2.160 from Dannerbauer et al. (2017), Tadaki et al. (2019); HELAISS02 at z  =  2.171 from Gómez-Guijarro et al. (2019); DRG55 at z  =  2.290 from Chapman et al. (2015); COS−SBC6 at z  =  2.323; COS−SBC3 at z  =  2.365 from Sillassen et al. (2024); HATLAS J084933 at z  =  2.410 from Ivison et al. (2013); COS−SBCX7 at z  =  2.415; COS−SBCX1 at z  =  2.422 from Sillassen et al. (2024); 4C23.56 at z  =  2.490 from Tadaki et al. (2019), Lee et al. (2017); CLJ1001 at z  =  2.510 from Wang et al. (2018); USS 1558−003 at z  =  2.530 from Tadaki et al. (2014, 2019); HXMM20 at z  =  2.602 from Gómez-Guijarro et al. (2019); COS−SBCX4 at z  =  2.646 from Sillassen et al. (2024).