... table¹

Again, you will need to re-display the image to see the effects of this command unless your graphics system is set to 256 colours.

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... file²

HDS container files can usually be identified by the fact they have a file type of . They can be used to store one or more standard Starlink NDF structures.

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... myndf³

The tyle parameter specifies the appearance of the annotated axes, and is given as a comma-separated group of attribute settings, each of which is a string specifying the attribute name and value. In this case, we assign values to the two attributes abel(1) and abel(2). The whole group must be enclosed in single quotes to prevent the parameter system splitting the string at the commas. The string must then also be enclosed in double quotes to prevent the UNIX shell from interpreting the parantheses and equals signs. A simpler way of specifying a ploting style is to put the attribute settings in a text file .

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... expression.⁴

The complete group expression syntax is described in SUN/150. This is the documentation for the GRP subroutine library, which provides a programming interface for obtaining groups of strings.

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... quotes.⁵

The up-arrow character is not one of these special characters, and so a simple reference to a single text file does not need to be enclosed in quotes.

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... `sticky'.⁶

The exceptions are the TEMPSTYLE parameters. These parameters are used to make temporary style changes and always forget any previous values assigned to them.

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... abort.⁷

This is because they may be synonyms recognised by other other applications.

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... plot.⁸

When displayed in a non-graphical environment (for instance, on an alpha-numeric terminal) the characters forming an escape sequence are stripped out of the string before the string is displayed.

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... database.⁹

``AGI'' is the name of the subroutine library that provides access to the graphics database. AGI stands for ``Applications Graphics Interface'', and is documented in SUN/48.

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... output.¹⁰

This rule does not apply to applications that manage the database itself rather than producing graphical output. Thus, for instance, it is legal for PICLIST to change the current picture if you request such a change. Also, an uncontrolled exit from an application, e.g. may leave the database in an abnormal state.

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... edges.¹¹

The current co-ordinate Frame in the image being used is RA/DEC and so the axis will be annotated in RA and DEC.

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....¹²

Pixel co-ordinates are fractional, where-as pixel indices are integer. The pixel with indices $(1,1)$ covers a range of pixel co-ordinates between $0.0$ and $1.0$ on each axis, with its centre at pixel co-ordinates $(0.5,0.5)$ .

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... mouse.¹³

Note, by default, the FRAME picture created by PICDEF is not constrained to be within the current picture, it can be anywhere within the BASE picture.

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... image.¹⁴

The accuracy of this alignment will depend on the accuracy of the astrometry information supplied with the image.

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... name.¹⁵

Most encapsulated PostScript devices start with the string .

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... landscape.¹⁶

The choice or portrait or landscape may also affect the orientation of the plot when the resulting PostScript file is included in a document.

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... follows¹⁷

You can include all the PostScript files, including any that do not contain any actual drawing commands.

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... 1.0¹⁸

NDC is like BASEPIC but the top-right corner of the device has NDC co-ordinates (1, 1).

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... NDF.¹⁹

For this and other reasons, new applications will avoid using AXIS structures, and make use of the more versatile WCS component  instead.

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... another.²⁰

A Mapping need not necessarily be defined in both directions. For instance, a Mapping that goes from a three-dimensional Frame to a two-dimensional Frame (maybe by simply throwing away one of the axis values) may not be defined in the other direction. KAPPA applications will report an error if a Mapping is not defined in the required direction. Another common example of a uni-directional Mapping is that between the GRID and AXIS Frames in cases where the AXIS structures are non-monotonic.

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... use²¹

Netscape is notorious for this. If you have problems allocating sufficient colours, try killing any netscape browsers you have running.

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... destructive²²

That is, the special bad value replaces the original data values, and so the original data values are lost.

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...ARDMASK²³

You can also plot the outline of the selected regions on top of a display image using ARDPLOT.

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... cancelled.²⁴

This is called `flushing' the error.

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... NDF.²⁵

If this is a problem, you can always put the INIT values into a file or positions list, using a different value for the MODE parameter.

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... value.²⁶

The actual value does not matter.

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... value.²⁷

The actual value does not matter.

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