Normally, the width of the margin may be between 1 mm and 6 mm; widths significantly greater than 6 mm will usually not give {TAIL ~ any saving} of {HEAD ~ material}, and a width of between 2 mm and 4 mm will usually be preferred, but in particular cases some advantages may still be obtained with margins up to 10 mm wide 
Normally , the width of the margin may be between 1 mm and 6 mm ; widths significantly greater than 6 mm will usually not give { TAIL ~ any saving } of { HEAD ~ material } , and a width of between 2 mm and 4 mm will usually be preferred , but in particular cases some advantages may still be obtained with margins up to 10 mm wide
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