DOCUMENT/SPICE
         |
         |- [CK]     This file describes SPICE pointing 
         |               data (called C-kernels) and their usage within SPICE.
         |
         |- [DAF]   This file describes the internal
         |               structure of binary SPICE kernels (CK and SPK).VM
         |
         |- [KERNEL]   This file describes the internal structure
         |               of ASCII SPICE kernels (TLS, TSC, TPC, etc.)
         |
         |- [PCK]   This file describes the planetary constants
         |               kernel (TPC)
         |
         |- [SCLK]    This file describes the spacecraft
         |               clock kernel (TSC) and the conversion of clock values into
         |               time values.
         |
         |- [SPK]   This file describes the spacecraft and planetary
         |               ephemeris data kernels (SP-kernel) and their usage within SPICE.
         |- [TIME]    This file describes time represetations
                         and conversions between them.