LUCI's ETC uses transmission data of all filters measured by the manufacturer [BARR]. The additional numbers are the identifiers for the filters. They are stored in wavelength steps of 0.5 nm as well as the previous wavelength-dependent datasets. The transmission curves of these broadband filters are shown in Figure 4. All available filters (including the narrowband filters) are shown in Appendix A.

Figure 4: Broadband filters used by LUCI
The optical filters U, B, V, R and I can be chosen for the input of the object's magnitude only. They are originally described in steps of 10 nm (U) and 20 nm (B, V, R and I) [FIL-HP]. By linear interpolation the sampling was increased to 0.5 nm.

Andre Germeroth 2014-07-17