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Assigning subject to query based on coverage from blast output file

Dear all, I have blast result in tabulated format. Each of the query hits multiple subject sequences. From all of those hits, I want to assign that subject sequence which covers the query sequence the most. Does any of you have a way to achieve this. I would really appreciate your ideas and resources. EDIT: I should have been much clear in my question. I have the following file. The best hit is uti_contig0036, but still "uti_contig7141"  covers the query more than "uti_contig0036".  contig996 uti_contig0036 80.4 903 110 34 7491 8352 2709010 2709886 1.00E-175 625 contig996 uti_contig0036 85.28 197 20 3 7793 7986 6423228 6423418 3.00E-46 195 contig996 uti_contig0036 76.76 327 46 15 7868 8168 6388503 6388181 2.00E-34 156 contig996 uti_contig0036 88.51 87 9 1 8203 8288 855009 855095 6.00E-19 104 contig996 uti_contig0036 93.44 61 3 1 8228 8288 3695407 3695348 2.00E-14 89.8 contig996 uti_contig0036 93.75 48 3 0 23516 23563 2295958 2295911 2.00E-09 73.1 contig996 uti_contig7141 80.22 819 97 35 7481 8280 2616628 2617400 1.00E-154 555 contig996 uti_contig7141 81.26 619 66 20 7721 8320 468207 467620 1.00E-124 455 contig996 uti_contig7141 ...

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