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Table 7
OI_VIS (revision 2).
| Label | Data type | Description |
| Keywords | ||
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| OI_REVN | I | Revision number: 2 |
| DATE-OBS | A | UTC start date of observations |
| ARRNAME | A | Identifies corresponding OI_ARRAY |
| INSNAME | A | Identifies corresponding OI_WAVELENGTH table |
| CORRNAME | A | (optional†) Identifies corresponding OI_CORR table |
| AMPTYP | A | (optional†) “absolute”, “differential”, “correlated flux” |
| PHITYP | A | (optional†) “absolute”, “differential” |
| AMPORDER | I | (optional†) Polynomial fit order for differential chromatic amplitudes |
| PHIORDER | I | (optional†) Polynomial fit order for differential chromatic phases |
| Column headings (one row for each measurement) | ||
|
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| TARGET_ID | I (1) | Target number as index into OI_TARGET table |
| TIME | D (1) | Zero. For backwards compatibility |
| MJD | D (1) | Modified Julian day |
| INT_TIME | D (1) | Integration time (s) |
| VISAMP | D (NWAVE) | Visibility amplitude |
| VISAMPERR | D (NWAVE) | Error in visibility amplitude |
| CORRINDX_VISAMP | J (1) | (optional) Index into correlation matrix for 1st VISAMP element |
| VISPHI | D (NWAVE) | Visibility phase in degrees |
| VISPHIERR | D (NWAVE) | Error in visibility phase in degrees |
| CORRINDX_VISPHI | J (1) | (optional) Index into correlation matrix for 1st VISPHI element |
| VISREFMAP | L (NWAVE,NWAVE) | (optional†) Matrix of indexes for establishing the reference channels (see text). |
| RVIS | D (NWAVE) | (optional) Complex coherent flux (Real) in units of TUNITn |
| RVISERR | D (NWAVE) | (optional) Error on RVIS |
| CORRINDX_RVIS | J (1) | (optional) Index into correlation matrix for 1st RVIS element |
| IVIS | D (NWAVE) | (optional) Complex coherent flux (Imaginary) in units of TUNITn |
| IVISERR | D (NWAVE) | (optional) Error on IVIS |
| CORRINDX_IVIS | J (1) | (optional) Index into correlation matrix for 1st IVIS element |
| UCOORD | D (1) | U coordinate of the data (m) |
| VCOORD | D (1) | V coordinate of the data (m) |
| STA_INDEX | I (2) | Station numbers contributing to the data |
| FLAG | L (NWAVE) | Flag |
Notes.
(†)
The conditional use of these keywords is discussed in Sect. 6.3.
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