How do I make the top line connect with the linear line so its all connected?

In [34]: from pylab import * Depth arange (200, 1050, 100) SurfaceZone array ([0 ,50 , 100 , 150, 200]) SurfaceZone] array ( [24 , 24, 24, 24, 24]) DeepZone array ([1000, 1100 , 1200, 1300, 1400, 1500]) DeepZone1-array ( [ 2 , 2, 2, 2,2,2]) y SurfaceZone temp=-0 . 022*Depth+24 x DeepZone plot (SurfaceZone, SurfaceZone1 ) plot (Depth, temp) plot ( DeepZone, DeepZone1 ) title ( "Depth vs Temperature") ylabel( "Temperature (Celcius) " ) xlabel ( "Depth(Metres) " ) grid (True) show ( ) 25 Depth vs Temperature 20 Temperature(Celcius) 15 10 0 200 400 600 1000 1200 1400 Depth(Metres)