Equation with variables into a line graph

Trying to create line graph of Enthalpy vs. Temperture. The equation being used is that of heat capacity which is Cp = A + B*T + C/T^2 + D*T^2. A,B,C, and D are all inputted values. T is temperature along the X-axis starting at 298 K going to 200K above the melting temperature (Tm) which is also an inputted value. There is also a jump in the line graph from solid to liquid, and that jump is the heat of fusion (Hf). The liquid line has the same equation but different values for A,B,C, and D. Need help ASAP. I know it's all over the place but feel free to ask specific. Attached is a picture of what it should look like. (exclude the gas portion)