How to add the center line in the middle of the picture in the test

[zxclovezby]

hello，please In test_data dirs the parameter of the center line in the middle of the image generated in data? I tried some but failed，in IGV_snapshots.bat file which parameter works？

$ cat IGV_snapshots.bat
new
genome hg19
snapshotDirectory IGV_Snapshots
load test_data/test_alignments.bam
load test_data/test_alignments2.bam
maxPanelHeight 500
goto chr1:713167-714758
snapshot chr1_713167_714758_h500.png
goto chr1:713500-714900
snapshot chr1_713500_714900_h500.png
goto chr1:714000-715000
snapshot chr1_714000_715000_h500.png
goto chr1:714001-714001
snapshot chr1_714001_714001_h500.png
exit