def get_sync_time(data):
"""
Get for each record the time (in ps) since the last sync.
"""
if len(data) == 0:
return np.zeros((0, 3), dtype='u8')
t0 = time.time()
print '* get times relative to previous syncs... ',
st = T2_tools.get_sync_time_ps(data)
t1 = time.time() - t0
print 'done ({:.2f} s).'.format(t1)
return st
