Switch to side-by-side view

--- a
+++ b/paf-prediction-challenge-database-1.0.0/p21c.hea
@@ -0,0 +1,3 @@
+p21c 2 128 38400
+p21c.dat 16 200/mV 12 0 38 28143 0 ECG0
+p21c.dat 16 200/mV 12 0 0 9792 0 ECG1