I searched but couldn't find the information I was looking for... First, is there a pre-packaged spark spread product offered? Second, if I were to go long natural gas and short electricity (this would be considered a spark spread right?) would I be correct in assuming these positions ordinarily vary inversely? Third, for positions like this (that ordinarily vary inversely) would the aggregate margin requirements be lower than the sum of margin requirements for each of the positions when held seperately? Thanks.