Switch to side-by-side view

--- a
+++ b/paf-prediction-challenge-database-1.0.0/n21.hea
@@ -0,0 +1,3 @@
+n21 2 128 230400
+n21.dat 16 200/mV 12 0 11 15676 0 ECG0
+n21.dat 16 200/mV 12 0 -6 -22034 0 ECG1