in the two notes , the shape of graph at the gradual contraction region is are different , which is correct ? the first one ? or the second one ?
in the first picture , we can see that the gradient of graph of HGL is increasing downwards , whereas in the second photo , the gradient of HGL is decreasing downwards? in the second picture , the shape of EGL at gradual contaction region is also different with the first one ? which is correct ?