From Discworld MUD Wiki
This is a template for a spellcheck box, detailing the chances of success/failure at various stages of a spell, based on bonuses in the relevant skills.
The parameters are:
- guild: 'Wizards' or 'Witches' as appropriate
- barsize: Width of skillbar section in pixels (default: 300)
- scale-min: Lowest scale value
- scale-max: Highest scale value
- intervals: Number of intervals in scale (default: 10)
- skill1: Full name of first skill
- threshold-low1: Minimum cutoff for skill (leave this blank if data is unknown for this skill)
- threshold-high1: Maximum cutoff for a linear skill dependency (leave this blank for exponential).
- half-life1: Half-life for an exponential skill dependency (leave this blank for linear).
And the above repeated for skills 2, 3, 4, etc.