NASA-Ames files - Interpreting the File Format Index

N.B. Almost all ACSOE files submitted to the BADC should fit into FFI 1001.
Some balloon sonde data from previous programmes have used FFI 2160.

1000 series

1001 - one real unbounded independent variable.
No auxiliary variables.
1010 - one real unbounded independent variable.
Auxiliary variables are real.
1020 - one real unbounded independent variable with implied values between the independent variable marks.
Auxiliary variables are real.

2010 - two real independent variables, one unbounded and one bounded with constant values.
Auxiliary variables are real.
2110 - two real independent variables, one unbounded and one bounded with its values recorded in the data records.
The first auxiliary variable is the number of bounded independent variables, the remainder are real.
2160 - two independent variables: one unbounded character variable and one real bounded one.
The first auxiliary variable is the number of bounded independent variables. At least one of the auxiliary variables is a character string.
2310 - two real independent variables, one unbounded and one bounded with its number of constant increment values, base value and increment defined in the auxiliary variable list.
The first three auxiliary variables are the no. of const increments, base value and increment described above; the other auxiliary values are real.

3010 - three real independent variables, one unbounded and two bounded with constant values defined in the file header.
Auxiliary variables are real.

4010 - four real independent variables, one unbounded and three bounded with constant values defined in the file header.
Auxiliary variables are real.