#Distribution
#from to #ORIs freq%
300 319   3     4.3
320 339   4     5.7
340 359   2     2.9
360 379  10    14.3
380 399  17    24.3
400 419   7    10.0
420 439  12    17.1
440 459   7    10.0
460 479   3     4.3
480 499   3     4.3
500 519   1     1.4
520 539   1     1.4
#Number of ORIs 70 Mean value=399.3, dispersion=46.8