margin calculation
Buy:
No margin is required, you pay the full premium.
Total Margin = ( Span + Exposure ) – Spread Benefit
Span or Initial margin : increases with time duration i.e. higher for two month compared to one month.
Closer the Strike Price : Higher the span, lower the exposure but total is also higher.
Exposure has got some minimum limit.
Margin components are proportionate to the quantity.
Dungla.com 
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