7 lines (6 with data), 252 Bytes

m011a 0 128 0 14:59:00 18/04/1990
# Start time=14:59
# First beat=15:01:06.695
# <age-range>: 60-64, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.429,  <RR-high-limit(sec)>: 1.093
# Note: recording with a timing signal, flutter-compensated