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(For a lightweight introduction to writing a McStas component you may also have a look at this m4v video from an old ESS workshop webpage)

First, let us discuss the overall structure of a McStas component, illustrated by the one of the simplest components, Slit.comp. The component realises an aperture or slit, in this case either a rectangular or circular opening in an absorbing material slab.

First we will have a look at the documentation header below. The various '''%-tags''' are parsed by mcdoc to define component online documentation like this [ ]

The first part including the '''%I''' information tag signifies who wrote the component and where.

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