### ANNOTATE

Annotate the plotted data

#### Description:

Each of the points on the plot is labelled with the appropriate internal label (if it has been read from the data file). If no parameters are specified, the default action is for the label to be written with a zero offset in X and an offset of approximately one character height in Y.

#### Usage:

annotate [xoff] [yoff] [justification]

#### Parameters:

##### XOFF = _REAL (Read and Write)
The X coordinate offset of the string relative to each data point. The application will use the value 0.0 (i.e. no offset) unless a value is given on the command line. [0.0]
##### YOFF = _REAL (Read and Write)
The Y coordinate offset of the string relative to each data point.

The application will prompt with a value of about 1/40th of the height of the viewport unless a value is given on the command line.

[1/40th of the viewport height.]

##### JUSTIFICATION = _REAL (Read and Write)
The justification about the point specified by XOFF and YOFF relative to each data point (in the range 0.0 to 1.0). Here, 0.0 means left justify the text relative to the data point, 1.0 means right justify the text relative to the data point, 0.5 means centre the string on the data point, other values will give intermediate justifications.

If no value is specified on the command line, the current value is used. The current value is initially set to 0.0.

##### PROJECTION = _CHAR (Read)
The projection that has been used to plot the data. This is explained in more detail in the section on projections. Allowed values: "NONE", "TAN", "SIN", "ARC", "GLS", "AITOFF", "MERCATOR", and "STG".

This parameter is not specified on the command line. The value of the global parameter PONGO_PROJECTN is used. If PONGO_PROJECTN is not defined, the default value "NONE" is used.

##### RACENTRE = _CHAR (Read)
The centre of the projection in RA (i.e. the angle must be specified as hh:mm:ss.sss). This parameter is only required for PROJECTION values other than "NONE".

This parameter is not specified on the command line. The value of the global parameter PONGO_RACENTRE is used. If PONGO_RACENTRE is not defined, the default value "0" is used.

##### DECCENTRE = _CHAR (Read)
The centre of the projection in declination (i.e. the angle must be specified as dd:mm:ss.sss). This parameter is only required for PROJECTION values other than "NONE".

This parameter is not specified on the command line. The value of the global parameter PONGO_DECCENTRE is used. If PONGO_DECCENTRE is not defined, the default value "0" is used.