volumetric optionality model changes forwarded zimin lu hou ect 06 15 2000 08 19 natasha danilochkina 06 15 2000 05 26 david gallagher lon ect ect peter crilly lon ect ect richard lewis lon ect ect haakon olafsson lon ect ect tony fricker lon ect ect andrew fairley lon ect ect matthew nicholas lon ect ect david redmond lon ect ect steven mccarthy lon ect ect dale surbey lon ect ect matthew nimmo lon ect ect matthew ferguson lon ect ect cc anjam ahmad lon ect ect zimin lu hou ect ect steven leppard lon ect ect stinson gibner hou ect ect subject volumetric optionality model changes result meetings zimin lu houston research anjam ahmad early june gas desk together research revising models pricing options volume swing similar products idea consistent method applied contracts affect flat price gas swing options indexed gas swing options j block contract modified thermbank contract enbank virtual storage new feature introduced models ability real time mtm prospectively sensitivities calculations work carried follows natasha danilochkina problem definition contracts products summary functional specification anjam ahmad zimin model modifications implementation houston london interaction start date june 16 th 2000 end date tbc