Correctly scaling ETMX L3 suspension channels

This makes a simple change on line 45 from an if to an elif. The saturation followup was ignoring the ETMX L3 channel check because the else statement only applied if the channel was not one of the 16-bit channels (introduced in a recent merge).

I also took the opportunity to make some changes consistent with PEP-8 styling.

Closes #109

locklost/plugins/saturations.py

@@ -15,8 +15,10 @@ from .. import data
 
 def find_saturations(event):
     """
+    Plots saturating suspension channels before lockloss.
+
     Create plot/list of saturating suspension channels before lockloss
-    time (with corresponding gps times for saturations).
+    time (and returns corresponding gps times for saturations).
     """
 
     saturation_threshold = config.SATURATION_THRESHOLD
@@ -40,7 +42,7 @@ def find_saturations(event):
             channel_name = str(buf.channel)
             if gps > config.ETMX_L3_CHANGE_DATE and channel_name in high_thresh_channels:
                 reduced_data = buf.data/(4*saturation_threshold)
-            if channel_name in low_thresh_channels:
+            elif channel_name in low_thresh_channels:
                 reduced_data = (4*buf.data)/saturation_threshold
             else:
                 reduced_data = buf.data/(saturation_threshold)
@@ -99,7 +101,6 @@ def find_saturations(event):
             wide_window = [first_sat - 40, segment[1] - gps]
         else:
             wide_window = [segment[0] - gps, segment[1] - gps]
-        #scaling_times = np.where(t < gps-5)[0]
         windows = [wide_window, zoomed_window]
         zoom_levels = ['WIDE', 'ZOOM']
         xmaxs = [gps, first_sat+gps]
@@ -140,7 +141,7 @@ def find_saturations(event):
                 horizontalalignment='center',
                 verticalalignment='bottom',
                 bbox=dict(boxstyle="round", fc="w", ec="black", alpha=0.95),
-                )
+            )
 
             # draw lines on plot for saturation thresholds, lock loss time
             ax.axhline(