--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test-data/combined.f9.bed.coverage	Sat Apr 28 15:07:26 2018 -0400
@@ -0,0 +1,125 @@
+chr15	95484290	95485433	Dbx2	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr15	95484290	95484390	Dbx2_window1	0	2	7	0	5	1	0	1	2	1	0	0	0	1	0	0
+chr15	95484340	95484440	Dbx2_window2	0	3	12	2	4	2	0	1	0	1	1	1	0	1	1	2
+chr15	95484390	95484490	Dbx2_window3	0	1	11	3	5	1	1	0	1	2	1	3	1	1	1	2
+chr15	95484440	95484540	Dbx2_window4	0	1	9	2	4	1	1	0	2	2	0	4	1	1	2	2
+chr15	95484490	95484590	Dbx2_window5	0	0	7	2	4	1	0	0	4	1	0	3	1	3	2	2
+chr15	95484540	95484640	Dbx2_window6	0	5	15	2	3	2	0	0	7	0	2	5	1	2	2	3
+chr15	95484590	95484690	Dbx2_window7	1	8	16	2	2	2	0	0	9	3	4	4	1	0	1	3
+chr15	95484640	95484740	Dbx2_window8	1	8	15	0	1	1	0	0	9	3	4	4	1	0	1	1
+chr15	95484690	95484790	Dbx2_window9	1	6	16	2	3	1	0	0	6	3	4	4	3	1	0	1
+chr15	95484740	95484840	Dbx2_window10	1	8	19	5	5	1	0	0	6	3	4	4	2	2	1	1
+chr15	95484790	95484890	Dbx2_window11	2	13	33	6	3	0	0	0	7	5	7	9	5	5	2	3
+chr15	95484840	95484940	Dbx2_window12	1	20	32	9	1	0	0	0	9	5	8	10	5	6	3	4
+chr15	95484890	95484990	Dbx2_window13	1	14	27	8	2	0	0	0	7	4	11	8	4	9	4	5
+chr15	95484940	95485040	Dbx2_window14	1	12	21	10	2	0	1	0	9	4	9	6	5	7	3	6
+chr15	95484990	95485090	Dbx2_window15	0	9	27	8	3	0	1	0	11	7	6	7	7	7	2	4
+chr15	95485040	95485140	Dbx2_window16	0	9	30	7	4	0	1	0	7	6	6	8	7	6	1	2
+chr15	95485090	95485190	Dbx2_window17	0	11	31	8	2	1	1	0	6	5	8	7	7	5	0	2
+chr15	95485140	95485240	Dbx2_window18	0	10	24	6	5	1	0	0	5	8	6	7	5	1	1	2
+chr15	95485190	95485290	Dbx2_window19	2	5	19	4	5	1	0	0	2	6	9	4	6	1	1	3
+chr15	95485240	95485340	Dbx2_window20	1	5	7	1	1	0	0	0	1	4	7	4	3	0	0	1
+chr15	95485290	95485390	Dbx2_window21	0	2	3	1	0	0	0	0	1	1	4	4	2	0	0	0
+chr15	95485340	95485440	Dbx2_window22	0	2	1	1	0	1	0	0	1	0	4	2	2	0	0	0
+chr10	20444676	20445116	Pde7b	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr10	20444676	20444776	Pde7b_window1	2	6	10	2	1	1	0	1	5	7	5	6	3	2	2	0
+chr10	20444726	20444826	Pde7b_window2	5	8	12	1	1	2	0	2	4	7	4	4	4	1	1	1
+chr10	20444776	20444876	Pde7b_window3	1	7	8	0	0	1	1	1	2	3	3	0	2	0	1	1
+chr10	20444826	20444926	Pde7b_window4	1	7	16	1	4	1	3	1	5	3	4	5	3	2	3	0
+chr10	20444876	20444976	Pde7b_window5	4	3	17	1	2	1	2	0	7	5	4	4	2	1	1	0
+chr10	20444926	20445026	Pde7b_window6	3	6	15	1	2	1	3	0	6	2	5	1	4	2	0	1
+chr10	20444976	20445076	Pde7b_window7	0	4	7	1	1	0	1	0	2	1	3	0	1	0	0	0
+chr10	20445026	20445126	Pde7b_window8	0	2	3	1	0	0	1	0	1	1	3	0	0	0	0	0
+chr18	58715130	58715849	Slc27a6	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr18	58715130	58715230	Slc27a6_window1	0	3	2	1	2	2	1	1	1	2	4	1	1	1	2	0
+chr18	58715180	58715280	Slc27a6_window2	0	3	3	2	2	3	1	2	4	3	8	2	4	1	1	0
+chr18	58715230	58715330	Slc27a6_window3	1	7	10	2	3	2	1	1	5	6	10	4	7	3	4	2
+chr18	58715280	58715380	Slc27a6_window4	1	9	13	2	3	7	1	3	9	9	14	8	11	5	7	0
+chr18	58715330	58715430	Slc27a6_window5	0	7	16	2	2	4	1	4	9	8	13	11	10	6	3	3
+chr18	58715380	58715480	Slc27a6_window6	0	13	19	3	1	6	2	4	12	8	11	10	7	8	3	4
+chr18	58715430	58715530	Slc27a6_window7	0	15	9	0	1	7	4	5	14	7	9	8	2	5	1	4
+chr18	58715480	58715580	Slc27a6_window8	1	11	11	1	2	6	3	7	11	9	7	7	2	2	0	4
+chr18	58715530	58715630	Slc27a6_window9	1	12	9	3	1	4	3	5	9	10	8	10	4	4	0	5
+chr18	58715580	58715680	Slc27a6_window10	0	9	6	4	1	5	1	4	8	9	8	7	3	2	0	4
+chr18	58715630	58715730	Slc27a6_window11	0	7	8	3	0	4	1	3	7	9	7	7	2	2	0	3
+chr18	58715680	58715780	Slc27a6_window12	1	3	6	1	0	2	2	2	6	6	1	4	2	1	0	0
+chr18	58715730	58715830	Slc27a6_window13	1	1	1	0	0	0	1	0	5	2	3	2	0	0	0	0
+chr18	58715780	58715880	Slc27a6_window14	1	0	1	0	2	0	1	0	6	3	3	1	0	0	0	0
+chr2	32816762	32817713	Rpl12	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr2	32816762	32816862	Rpl12_window1	0	6	1	0	3	2	3	0	3	1	2	2	0	0	0	0
+chr2	32816812	32816912	Rpl12_window2	0	3	1	0	1	3	3	0	7	2	1	2	0	0	0	0
+chr2	32816862	32816962	Rpl12_window3	0	2	2	2	0	4	4	1	6	3	1	2	0	0	0	0
+chr2	32816912	32817012	Rpl12_window4	1	8	11	3	1	9	5	1	10	6	2	4	3	1	0	1
+chr2	32816962	32817062	Rpl12_window5	3	25	24	3	5	12	7	3	17	8	11	8	6	1	0	2
+chr2	32817012	32817112	Rpl12_window6	3	26	22	4	6	13	7	4	14	8	13	8	6	0	2	2
+chr2	32817062	32817162	Rpl12_window7	1	10	18	5	2	4	3	3	8	1	7	8	4	1	2	0
+chr2	32817112	32817212	Rpl12_window8	1	20	18	5	2	7	4	1	7	4	7	10	5	2	3	0
+chr2	32817162	32817262	Rpl12_window9	4	24	24	7	7	8	10	5	11	12	8	11	3	3	3	2
+chr2	32817212	32817312	Rpl12_window10	2	20	15	4	8	8	9	5	14	9	9	10	3	3	1	1
+chr2	32817262	32817362	Rpl12_window11	2	19	21	3	4	15	8	5	19	9	13	11	4	6	1	3
+chr2	32817312	32817412	Rpl12_window12	1	22	18	3	5	13	9	6	21	10	13	11	4	4	2	4
+chr2	32817362	32817462	Rpl12_window13	1	15	10	2	3	8	5	3	9	7	7	7	2	3	1	3
+chr2	32817412	32817512	Rpl12_window14	0	10	5	0	1	6	2	1	6	4	4	3	2	2	1	2
+chr2	32817462	32817562	Rpl12_window15	1	11	6	0	2	6	4	1	7	5	4	4	2	3	2	1
+chr2	32817512	32817612	Rpl12_window16	2	9	6	1	1	4	5	0	6	7	1	5	2	4	2	0
+chr2	32817562	32817662	Rpl12_window17	2	9	8	1	2	2	5	1	7	6	1	5	2	2	1	0
+chr2	32817612	32817712	Rpl12_window18	2	5	7	1	2	2	4	1	4	4	1	4	1	2	0	0
+chr2	32817662	32817762	Rpl12_window19	2	6	8	0	0	1	2	1	3	3	2	2	0	3	0	0
+chr9	106331200	106332399	Rpl29	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr9	106331200	106331300	Rpl29_window1	1	4	5	3	0	3	3	1	7	6	2	3	1	1	0	0
+chr9	106331250	106331350	Rpl29_window2	1	5	6	2	2	4	6	0	6	5	3	2	2	0	0	0
+chr9	106331300	106331400	Rpl29_window3	1	8	5	1	1	2	7	2	9	5	6	3	1	0	0	0
+chr9	106331350	106331450	Rpl29_window4	2	8	7	1	2	5	9	4	13	9	7	3	2	0	0	0
+chr9	106331400	106331500	Rpl29_window5	1	8	11	2	2	7	7	5	17	9	6	5	4	1	0	0
+chr9	106331450	106331550	Rpl29_window6	3	8	18	2	3	10	10	4	18	10	7	7	5	2	0	1
+chr9	106331500	106331600	Rpl29_window7	5	8	24	3	2	15	11	2	16	9	8	7	5	2	0	2
+chr9	106331550	106331650	Rpl29_window8	4	5	23	4	1	13	9	3	13	9	7	5	4	4	0	2
+chr9	106331600	106331700	Rpl29_window9	2	4	14	5	2	9	5	3	6	5	5	7	2	2	0	2
+chr9	106331650	106331750	Rpl29_window10	2	33	46	11	7	12	6	5	6	9	8	9	7	4	1	2
+chr9	106331700	106331800	Rpl29_window11	5	29	31	8	6	15	3	4	9	10	9	9	6	8	1	4
+chr9	106331750	106331850	Rpl29_window12	5	30	37	3	3	13	6	4	13	11	11	13	4	9	1	2
+chr9	106331800	106331900	Rpl29_window13	3	18	27	2	4	12	6	5	5	8	11	12	4	8	1	3
+chr9	106331850	106331950	Rpl29_window14	1	12	23	2	3	12	7	4	7	11	12	6	5	6	1	2
+chr9	106331900	106332000	Rpl29_window15	0	13	27	3	6	11	9	3	9	14	15	8	3	5	1	2
+chr9	106331950	106332050	Rpl29_window16	1	10	22	2	3	10	8	0	10	13	13	9	3	6	1	2
+chr9	106332000	106332100	Rpl29_window17	3	9	16	0	4	8	5	0	10	9	13	6	2	5	0	1
+chr9	106332050	106332150	Rpl29_window18	1	3	10	0	4	6	8	1	12	6	9	6	4	1	0	1
+chr9	106332100	106332200	Rpl29_window19	1	4	10	1	4	6	9	1	11	7	9	7	5	2	0	1
+chr9	106332150	106332250	Rpl29_window20	0	3	6	4	4	6	7	1	10	6	7	6	3	2	0	1
+chr9	106332200	106332300	Rpl29_window21	0	1	0	2	3	3	4	1	4	3	2	1	2	1	0	0
+chr9	106332250	106332350	Rpl29_window22	0	0	2	2	2	2	5	2	6	2	2	1	3	1	0	0
+chr9	106332300	106332400	Rpl29_window23	0	0	2	2	1	1	5	2	3	0	2	2	2	0	0	0
+chr2	153116826	153117777	Kif3b	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr2	153116826	153116926	Kif3b_window1	1	1	5	1	1	6	5	0	10	1	5	1	1	1	0	0
+chr2	153116876	153116976	Kif3b_window2	2	6	14	3	4	13	5	2	14	2	7	2	1	1	0	0
+chr2	153116926	153117026	Kif3b_window3	1	7	18	2	3	12	6	1	12	3	6	4	1	2	0	0
+chr2	153116976	153117076	Kif3b_window4	0	7	14	1	3	9	5	1	8	3	3	2	1	2	0	0
+chr2	153117026	153117126	Kif3b_window5	1	7	14	7	9	9	7	3	9	4	6	6	3	3	0	0
+chr2	153117076	153117176	Kif3b_window6	2	14	24	6	7	6	12	1	7	6	10	9	4	2	0	1
+chr2	153117126	153117226	Kif3b_window7	0	7	12	2	3	5	8	2	3	4	6	7	2	4	1	1
+chr2	153117176	153117276	Kif3b_window8	3	20	22	5	7	12	9	5	7	9	9	7	7	6	1	5
+chr2	153117226	153117326	Kif3b_window9	4	24	22	6	9	12	10	6	11	9	9	10	9	6	1	3
+chr2	153117276	153117376	Kif3b_window10	4	23	25	4	10	12	9	5	13	7	8	7	8	5	1	3
+chr2	153117326	153117426	Kif3b_window11	2	15	21	4	9	8	7	2	13	5	8	6	4	3	2	2
+chr2	153117376	153117476	Kif3b_window12	1	17	19	4	7	8	10	2	13	5	9	6	5	2	3	2
+chr2	153117426	153117526	Kif3b_window13	1	16	17	5	6	8	8	2	9	5	9	4	4	3	3	1
+chr2	153117476	153117576	Kif3b_window14	3	7	10	3	6	4	5	1	7	2	6	1	1	1	1	0
+chr2	153117526	153117626	Kif3b_window15	3	3	8	1	5	2	4	1	7	2	2	2	1	2	0	2
+chr2	153117576	153117676	Kif3b_window16	1	4	5	0	5	2	4	0	4	1	6	3	2	1	0	1
+chr2	153117626	153117726	Kif3b_window17	0	3	3	0	2	3	1	0	3	1	5	2	2	1	0	1
+chr2	153117676	153117776	Kif3b_window18	0	1	2	0	3	1	0	0	3	0	2	2	1	1	0	0
+chr2	153117726	153117826	Kif3b_window19	1	2	3	1	2	0	0	0	4	1	2	2	1	1	0	0
+chr1	133049497	133050192	Eif2d	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
+chr1	133049497	133049597	Eif2d_window1	0	3	2	3	1	4	3	1	9	1	2	1	3	1	0	0
+chr1	133049547	133049647	Eif2d_window2	1	9	5	4	2	7	3	1	10	2	2	2	4	0	0	1
+chr1	133049597	133049697	Eif2d_window3	1	14	6	2	3	6	4	1	9	2	1	3	4	0	0	1
+chr1	133049647	133049747	Eif2d_window4	1	11	6	3	0	3	4	0	4	0	0	3	2	0	0	1
+chr1	133049697	133049797	Eif2d_window5	14	36	42	10	6	4	11	5	7	2	4	4	7	0	0	1
+chr1	133049747	133049847	Eif2d_window6	6	24	18	7	4	6	10	4	6	5	6	5	4	2	1	1
+chr1	133049797	133049897	Eif2d_window7	5	19	26	4	5	9	9	4	8	6	7	7	5	2	2	0
+chr1	133049847	133049947	Eif2d_window8	5	16	32	4	7	7	12	4	9	5	6	7	5	2	1	0
+chr1	133049897	133049997	Eif2d_window9	4	13	31	3	7	5	12	2	6	3	4	5	4	1	1	0
+chr1	133049947	133050047	Eif2d_window10	2	6	19	3	4	4	9	1	4	2	1	5	3	0	0	0
+chr1	133049997	133050097	Eif2d_window11	1	4	8	2	0	4	6	0	2	3	1	3	1	0	0	0
+chr1	133050047	133050147	Eif2d_window12	1	3	9	1	1	2	5	0	2	3	1	2	2	0	0	0
+chr1	133050097	133050197	Eif2d_window13	0	2	4	1	2	1	3	0	3	2	1	1	1	0	0	0