length freq
 19.75    4
 21.75   10
 23.75   21
 25.75   11
 27.75   14
 29.75   31
 31.75   39
 33.75   70
 35.75   71
 37.75   44
 39.75   42
 41.75   36
 43.75   23
 45.75   22
 47.75   17
 49.75   12
 51.75   12
 53.75   11
 55.75    8
 57.75    3
 59.75    6
 61.75    6
 63.75    3
 65.75    2
   Inf    5
