7 lines (6 with data), 250 Bytes

m209a 0 128 0 9:40:00 09/06/1990
# Start time=09:40
# First beat=09:49:59.648
# <age-range>: 40-44, <sex>: Male, <medication>: None
# <RR-low-limit(sec)>: 0.46,  <RR-high-limit(sec)>: 1.257
# Note: recording with a timing signal, flutter-compensated