Size Meaning
4 distance into dash pattern to start (user coordinates)
4 /n/ - number of elements in pattern
4n dash elements - each is a length in user coords
Each element gives a length of dash, starting with an on dash, aternating on - off, looping round the list of elements. Hence if n is odd the second time round elements which were on first time round will now be off, and vica versa.
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