diff --git a/plot.py b/plot.py
index 381e3ae..c395ead 100644
--- a/plot.py
+++ b/plot.py
@@ -244,7 +244,7 @@ def save_plot(plot_name):
 
 def labeled_timeperiod(ax, start, end, text, color='lightgrey', y_height = 100):
 	centre = start + (end - start) / 2
-	ax.axvspan(start, end, color=color, alpha=0.5)
+	ax.axvspan(start, end, color=color, alpha=0.2)
 	ax.text(centre, ax.get_ylim()[1] * (y_height / 100), text, bbox={
 		'boxstyle': 'square',
 		'fc': color,