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hi
right in s.c 4.0 there  is  an option calculator
you need to input  days to expiration  and it calculates the  premium based 
on inputted  volatility
so i keep inputting different volatility  until i get the current  to agree 
with the current price,
for this to be accurate one must get  the most active option  to get the 
volatility right
hope this helps
Ben
p. s  i keep a  record on  each commodity  for  volatility #
(to compare current to aver  historical)
 
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