NYMEX HH, NYMEX NN, ICE NG LD1 Henry, and ICE NG LD1 ICE Lots Henry are all financially settled vs the NYMEX NG final trading day settlement price. The only difference between the products (other than exchanges) is contract size. NYMEX HH is 10,000 MMbtu/month, NYMEX NN and ICE NG LD1 Henry are...