Table 2.

Comparison of chromosome lengths and gaps between Ash1 and GRCh38. Chromosome lengths exclude all “N” characters. Every sequence of Ns was counted as a gap except for leading and trailing Ns. Several GRCh38 chromosomes begin or end with lengthy sequences of Ns numbering millions of bases; these were not counted as gaps here

Chr	Ash1 v1.7			GRCh38.p13
	Length (bp)	Gap length	No. of gaps	Length (bp)	Gap length	No. of gaps
1	232,280,045	18,214,772	193	230,481,014	18,455,408	164
2	241,581,444	1,282,527	66	240,548,237	1,625,292	24
3	199,411,976	76,238	57	198,100,142	125,417	20
4	190,408,510	301,999	18	189,752,667	441,888	16
5	181,608,321	176,942	62	181,265,378	202,881	35
6	170,304,801	502,300	23	170,078,523	607,456	13
7	160,669,899	205,711	66	158,970,135	355,838	15
8	144,953,907	151,700	15	144,768,136	250,500	10
9	122,110,712	16,459,698	110	121,790,553	16,534,164	41
10	134,496,302	289,022	41	133,262,998	514,424	42
11	135,108,547	191,392	72	134,533,742	482,880	15
12	135,338,731	36,440	82	133,137,819	117,490	25
13	98,916,572	129,842	57	97,983,128	371,200	18
14	90,842,875	254,999	49	90,568,149	315,569	23
15	91,928,716	336,427	34	84,641,325	339,864	17
16	82,665,194	8,252,197	64	81,805,944	8,412,401	19
17	83,177,337	171,631	30	82,920,216	267,225	34
18	81,463,364	66,719	72	80,089,605	163,680	59
19	67,231,982	98,278	16	58,440,758	106,858	7
20	65,005,954	106,299	121	63,944,257	329,910	88
21	40,375,064	758,589	80	40,088,622	1,601,361	47
22	42,624,612	729,999	117	39,159,782	1,138,686	42
X	153,528,413	671,671	38	154,893,034	1,127,861	27
Y	27,085,372	33,413,257	33	26,415,048	30,792,367	54
Total	2,973,118,650	82,878,649	1516	2,937,639,212	84,680,620	855