Hey guys, I need some clarification between these 2 data sets.

I was studying a refrigeration system that uses R404A. I graphed the refrigeration cycle on a P-H Diagram to get a better idea of what was going on. After that, i looked up a Pressure-Temp Chart for R404 and noticed things were not adding up. On the PH Diagram R404 is at 0*F at a pressure of about 50psia, however according the Pressure-Temp Chart for the same refrigerant, @ 0*F P=33.5 psig. Am i missing something here?

Thanks in advance!