Hair is treated with a copolymer of an unsaturated ester and a styrene sulphonate monomer to reducing damage to hair caused by subsequent heat treatment. Engine calibration coefficients to control EGR rate, timings and quantities of fuel injection pulses, turbocharger boost, etc, can be determined to compensate for the lower energy content of such oxygenate blends compared to diesel fuels. A sled or sleds are connected to the barrel member such that rotation and movement of the barrel member will in turn move the sled or sleds. The GIS further can include at least one database operation configured to process a database query against geo-spatial data stored in the database. The technique further includes determining a first eye convergence distance based on the first vergence angle, the second vergence angle, and an interocular distance between the left eye and the right eye.