be ascertained by connecting the x and y values with smooth continuing arcs each profile section 38 at each distance z is fixed the airfoil profiles of the various surface locations between the distances z are determined by smoothly connecting the adjacent profile sections 38 to one another to form 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 ii 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 must be accounted for in the actual profile of the airfoil accordingly the values for the profile given in table ii are for a nominal airfoil it will therefore be appreciated that u00b1 typical manufacturing tolerances i e u00b1 values including any coating thicknesses are additive to the x and y values given in table ii accordingly a distance of u00b1 0 160 inches in a direction normal to any surface location along the airfoil profile defines an airfoil profile envelope for this particular bucket airfoil design and turbine i e a range of variation between measured points on the actual airfoil surface at nominal cold or room temperature and the ideal position of those points as given in table ii below at the same temperature the bucket airfoil design is.