--- /dev/null
+Schott PK51A, 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 1.156108e+000\r
+C1 5.855974e-003\r
+B2 1.532293e-001\r
+C2 1.940724e-002\r
+B3 7.856190e-001\r
+C3 1.405370e+002\r