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Hi, I'm experiencing the same issue with water uptake — the calculated uptake is zero at partial pressures corresponding to certain relative humidity values. I noticed something unusual: when I set the external pressure to 101325 Pa at 298 K, the simulation gives an uptake value which is similar to paper results at the saturation point. I put a range of 0-101325 pa for external pressure, the resulting isotherm shows the same uptake trend and point, but now with p₀ = 101325 Pa instead of 31.7 kPa, which is the correct saturation pressure. I'm not sure why the uptake appears at such a high pressure, especially since water should already be in liquid form at 101325 Pa. Let me know if you've figured out what the issue might be.