a function of the distance traveled in direction u201c x u201d as shown in fig2 a the average cd is shown on axis 302 of fig3 a while the distance traveled in direction u201c x u201d is shown on axis 304 as illustrated by curve 306 the variation in cd ranged from about 1753 nm at x 0 u03bcm to about 1746 u03bcm at x 2700 u03bcm to about 1754 nm at x 5 400 u03bcm the difference in cd was only about 7 8 nm over the entire length of the chrome line 0047 fig3 b shows a graph 320 which illustrates the average cd for the distance d 4 of a chrome line which was produced on the upper surface of quartz substrate 108 in accordance with fig2 b as a function of the distance traveled in direction u201c x u201d as shown in fig2 b the average cd is shown on axis 322 of fig3 b while the distance traveled in direction u201c x u201d is shown on axis 324 as illustrated by curve 326 the variation in cd ranged from about 1780 nm at x 0 u03bcm to about 1758 nm at x 2700 u03bcm to about 1782 nm at x 5 400 u03bcm the difference in cd was 23 nm over the length of the chrome line a series.