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σ-Profiles of (a, b) selected single-component refrigerants used in this work, (c) R744 (blue) + R290 (black) binary mixtures at 25 (red), 50 (green), and 75 (pink) mole% ratios of R290, and (d) R744 + R290 at 1:1 ratio with the addition of 25 (blue), 50 (red), 75 (green), and 100% (pink) of R134a mole fractions.
