New phase diagram of carbon dioxide with anomalous region (enclosed by ζ₁ = 0, ζ₃ = 0, ζ₄ = 0 loop) and the boundary of liquid/supercritical (SC) liquid-like state as defined by the ζ₂ = 0 loop, together with the Dwij point (DP) and SC solid-like state (adapted from V. Prasad et al. 2025, an open access article). Note that the maxima of ﹩{({c}_{p}^{* })}_{T}﹩ and (β*)_P yield the SC liquid-like/SC gas-like boundary (lower side), whereas the minima prescribe the SC liquid-like/SC solid-like boundary (upper side).