z distance along the length of the airfoil can be ascertained by connecting the x and y values with smooth continuing arcs each profile section 66 at each distance z can be fixed the airfoil profiles of the various surface locations between the distances z are determined by smoothly connecting the adjacent profile sections 66 to one another thus forming the airfoil profile these values represent the airfoil profiles at ambient non operating or non hot conditions and are for an uncoated airfoil the table values are generated and shown to three decimal places for determining the profile of the airfoil there are typical manufacturing tolerances as well as coatings which should be accounted for in the actual profile of the airfoil accordingly the values for the profile given are for a nominal airfoil it will therefore be appreciated that u00b1 typical manufacturing tolerances such as u00b1 values including any coating thicknesses are additive to the x and y values therefore a distance of about u00b1 0 160 inches in a direction normal to any surface location along the airfoil profile defines an airfoil profile envelope for a rotor blade airfoil design and compressor in other words a distance of about u00b1 0 160 inches in a direction normal to any surface location along the airfoil profile defines a range of variation between measured points on the actual airfoil surface at nominal cold or room temperature and the ideal.