Formulas:
Stream1=MVA(2*a1-HHV),
Stream2=MVA(2*a1-LLV),
Stream3=MVA((HHV2+LLV2+Price)/3),
Stream4=(Stream1+Stream2+Stream3)/3, where
a1=(HHV+LLV+Price)/3,
HHV[i] - maximum price from i-Period to i,
LLV[i] - minimum price from i-Period to i,
HHV2 - maximum price from i-Period/2 to i,
LLV2 - minimum price from i-Period/2 to i.
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