Keywords: class

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## File index

The Entry Indexes, gathered into Extension Indexes, are ruled by the Classic Data Container specifications. According to these, the index contents are let free to Class. They are described below for files version 1 and 2.

Table: Index version 1 (found in files version 1). Note that index length is 32 words (so that 4 of them fit in a 128 words record), even if 10 words are left unused.
Position | Parameter | Fortran Kind | Unit | Purpose
1 | `bloc` | Integer*4 | Record | Record where observation is to be found
2 | `num` | Integer*4 |  | Observation number
3 | `ver` | Integer*4 |  | Observation version
4-6 | `csour` | Character*12 |  | Source name
7-9 | `cline` | Character*12 |  | Line name
10-12 | `ctele` | Character*12 |  | Telescope name
13 | `dobs` | Integer*4 | GAG date | Observation date
14 | `dred` | Integer*4 | GAG date | Reduction date
15 | `off1` | Real*4 | Radian | Lambda offset
16 | `off2` | Real*4 | Radian | Beta offset
17 | `type` | Integer*4 | Code | Coordinate system
18 | `kind` | Integer*4 | Code | Kind of data
19 | `qual` | Integer*4 | Code | Quality of data
20 | `scan` | Integer*4 |  | Scan number
21 | `posa` | Real*4 | Radian | Position angle (drifts)
22 | `subscan` | Integer*4 |  | Subscan number
23-32 | (unused) |  |  | Padding to 32 words

Table: Index version 2 (found in files version 2)
Position | Parameter | Fortran Kind | Unit | Purpose
1-2 | `bloc` | Integer*8 | Record | Record where observation is to be found
3 | `word` | Integer*4 | Word | Word where the obs. starts in this record
4-5 | `num` | Integer*8 |  | Observation number
6 | `ver` | Integer*4 |  | Observation version
7-9 | `csour` | Character*12 |  | Source name
10-12 | `cline` | Character*12 |  | Line name
13-15 | `ctele` | Character*12 |  | Telescope name
16 | `dobs` | Integer*4 | GAG date | Observation date
17 | `dred` | Integer*4 | GAG date | Reduction date
18 | `off1` | Real*4 | Radian | Lambda offset
19 | `off2` | Real*4 | Radian | Beta offset
20 | `type` | Integer*4 | Code | Coordinate system
21 | `kind` | Integer*4 | Code | Kind of data
22 | `qual` | Integer*4 | Code | Quality of data
23 | `posa` | Real*4 | Radian | Position angle (drifts)
24-25 | `scan` | Integer*8 |  | Scan number
26 | `subscan` | Integer*4 |  | Subscan number

Next: The Header and Data Up: Internal CLASS Format Previous: File organization Contents Index