Use this data to deduce the shape of the relief valve curve

Question

Question: A 1.79-in³ displacement motor is turning at 804 rpm and delivering 340 lbf-in of torque. The operator notices that motor speed decreases as load increases and the torque demand is greater than 340 lbf -in. The operator collected the following data:

Use this data to deduce the shape of the relief valve curve. Plot this curve flow across relief valve (in³/s) vs. pressure (psi).