# Air mass curve files

The table of air mass coefficients is stored in the ASCII format; lines are separated `CR+LF`, `LF` or `CR` character. The writer can choose any separator, it is recommended to use a separator native to the writer’s environment. The reader must correctly handle any separator. The first line contains a list of column names separated by a single space character. Second line is left empty.

On the following lines, the table values are stored. The values are separated by a space character, rows are separated by an end-of-line character (see above). Parsers must ignore all additional white characters between fields, at the beginning and at the end of a line. See table 1 for the description of the columns.

Table 1

Keyword | Description
--- | ---
JD | Geocentric Julian date of observation
AIRMASS | Air mass coefficient
ALTITUDE | Apparent altitude in degrees above horizon