Isobar Curves on T-s Diagram

What does an isobar curve (line of constant pressure) look like for an ideal gas with constant specific heat look like on a T-s (temperature-entropy) diagram? In class, we draw an upward sloping curve, by hand. This file quantifies, graphically, how to plot an isobar curve to-scale.

Also illustrated and quantified, for an ideal gas with constant specific heat, are T-s isochor curve (line of constant specific volume) and P-v isotherm (line of constant temperature) .