Switch to side-by-side view

--- a
+++ b/mit-bih-ecg-compression-test-database-1.0.0/12531_01.hea
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+12531_01 2 250 5120
+12531_01.dat 212 400 12 0 10 -7161 0 ECG
+12531_01.dat 212 400 12 0 38 15677 0 ECG