- Structure of Blue Files:
  - There are three main parts to a Blue File:
    Main Header
      The Main Header is divided into two sections:

      Fixed | Basic information about the file (start values, deltas, units).
      | Fields common to all Blue files.
      | Three keywords (called main header keywords).
      Adjunct | Details about the file layout (varies based on file type).
      | May include system modeling information.

    Data
      The binary data of the file.
    Extended Header
      Stores keywords (auxiliary information about the file).
- Indexing into a Blue Files:
  - It is important to note that different Midas frameworks use different indexing systems when accessing elements of a file.

    X-Midas | Uses one-based indexing which matches VMS and Fortran standards.
    NeXtMidas | Uses zero-based indexing which matches Unix and Java/C/C++ standards.

X-Midas Users Take Note:
Prior to the release of the Blue file specification some versions of Martes created Blue files with a non-standard extended header. X-Midas has been modified to allow most of the non-standard files to be read correctly.