nothing important, just trailing spaces and all

interface.py

@@ -155,7 +155,7 @@ def optical_path(window, photon):
     length = len(photon.state0)
     for i in range(length):
         time = Time(i,photon,window)
-        time.do()       
+        time.do()
         if i != length-1:
             plate_number = Label(window, text = 'Plate' + str(i+1), font = ('Bahnschrift Semibold','15'), fg = '#000000', bg = '#ffffff', relief = 'raised')
             plate_number.grid(column = 2*i+1, row = 0)
@@ -206,4 +206,4 @@ def graphical_grid_init():
     button_simulate.grid(column = 7, row = 6)
     root.mainloop()
 
-graphical_grid_init()
\ No newline at end of file
+graphical_grid_init()