Bill, Lines 1-3-5 were turf lines so they are out.
Lines 2-4-6 were only ones left as the lines below line 6were not in this distance catagory. I chose line 6 as the best of last 3 comparable , since 7f is ( in my opinion) closer to a route. In this instance I was wrong.
I have had some nice prices following this procedure.
Had this horse have had any 6.5 or 7f races then I would have used one of them instead. Hope this answers your question.