--- /dev/null
+Schott FK52, 313nm - 2325nm\r
+USER\r
+2 1\r
+SQRT(1+B1*wvl^2/(wvl^2-C1)+B2*wvl^2/(wvl^2-C2)+B3*wvl^2/(wvl^2-C3))\r
+0\r
+B1 1.015711e+000\r
+C1 5.158849e-003\r
+B2 1.699984e-001\r
+C2 1.733808e-002\r
+B3 8.051585e-001\r
+C3 1.586033e+002\r