--- /dev/null
+Schott FK5, 280nm - 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 8.443093e-001\r
+C1 4.751120e-003\r
+B2 3.441478e-001\r
+C2 1.498148e-002\r
+B3 9.107902e-001\r
+C3 9.786003e+001\r