'Data for two-point ray tracing' 102 -3 -2 0.000001 0.005 / (ISRFR,ISRFX1,ISRFX2,XERR,AERR) 1.7 -.2 0.5 -.2 1.7 0.3 10 4 1 / / / / The above data are suitable for models QI, QI2 and QI4. / For model QI8 use the following data: / 1.7 -.2 0.7 -.2 1.7 0.6 10 8 1 /