trading levels

oil 9-6-10
trading levels lows 69,5 highs 74,2
R3 73,8
R2 73,1
R1 72,4
N VALUE 71,9
S1 71,3
S2 70,7
S3 70,1

This is today's levels that I use

sell as close to the highest level that is possible
buy as close to the lowest level that is possible
and sometimes it gets a little trade between levels if it feels right for the moment