Perhaps that is some dissected cash calc per duration. If so, cool. Edit: Yeah, it would have to be tied to opex. I just bought the VIX 16/23/30 June op fly for 3.15 risk (iron, short g).
Long 1 Jun outright (25.72) and long 4 of the Jun 24 synthetics from 1.75 to hedge the fly. Small hedge.