Added zero-lines to TSQ-zce view

prasopes/zcetools.py

@@ -24,6 +24,8 @@ def pop_dial(zcespec, gradspect, data_set, coff_d, grad_d,
     coff_d['y'] = np.mean(data_set['matrix'], axis=0)
     grad_d['x'] = coff_d['x']
     grad_d['y'] = -np.gradient(coff_d['y'])
+    gradspect.axhline(0, color="#FF000088", linestyle=":")
+    zcespec.axhline(0, color="#0000FF88", linestyle=":")
     gt.pop_plot(zcespec, coff_d)
     gt.pop_plot(gradspect, grad_d)
     grad_d['line'][0].set_color("red")