lod_drop_rng: Find Haplotype Region with LOD scores within QTL Peak Drop
In duytpm16/qtl2utils: Modification of QTL2 Plots

This function finds the haplotype region with LOD scores within the QTL peak drop.

1	lod_drop_rng(markers, scan1_output, max_chr, max_peak, hilit_drop)

`markers`	A dataframe of marker positions.
`scan1_output`	Output of `scan1()`.
`max_chr`	Character value of the haplotype's QTL peak chromosome. This can be obtained from `max_scan1()` 'chr' column.
`max_peak`	Numeric value of the haplotype's QTL peak LOD score. This can be obtained from `max_scan1()` third column.
`hilit_drop`	Positions with LOD scores within this amount of the QTL peak will be returned.