### MARK

Draw a point mark at the specified position

#### Description:

Draw a point mark at a specified position.

This command is a synonym for PRIM K.

#### Usage:

mark x y [symbol]

#### Parameters:

##### X = _REAL (Read and Write)
The X coordinate of the point.

[The value is prompted for.]

##### Y = _REAL (Read and Write)
The Y coordinate of the point.

[The value is prompted for.]

##### SYMBOL = _INTEGER (Read and Write)
The PGPLOT symbol number for drawing the point mark.

If no value is given on the command line, the current value is used. The current value is initially set to 1.

##### PROJECTION = _CHAR (Read)
The geometry that is to be used for plotting. 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_DECENTRE is used. If PONGO_DECCENTRE is not defined, the default value "0" is used.

#### Notes:

When using non-planar coordinates, the coordinates should be given in degrees.