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6FDA-6FpDA PI with ~20 bar of methane (C = purple, H = white), nitrogen (N = blue) and carbon dioxide (C = yellow, O = red) (top row). 6FDA-6FpDA PI. binary 2:1 CH4/N2 (middle row); 6FDA-6FpDA PI. ternary 16:8:1 CH4/N2/CO2 (bottom row) [68].
