3 Typographic Conventions

The following typographic conventions are used in this cookbook.

Anything that is to be typed into a computer program via the keyboard, or output from one via the screen, is indicated by a ‘typewriter’ font like this.

Lines that are to be typed into the computer are shown beginning with a % sign, for example:

  % photom

The % indicates the Unix ‘shell prompt’ and should not be typed in. However:

items appearing in graphical windows, such as those used by GAIA or xcatview, are shown in a sans serif font like this.


items of particular importance are shown in bold and indented paragraphs like this one.

Asides and points of interest are usually shown as footnotes.

Part I
Background Material