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Hi, That's right - a positive number indicates that tp2 > tp1 in terms of volume. All the best, Mark On 23 Jul 2011, at 18:59, Gonzalo Rojas Costa wrote: > Hi: > > Maybe a foolish question: if I do a longitudinal comparison with > SIENA tp1 tp2, and I got a positive PBVC value, that means that tp2 > has more volume than in tp1 ?... > > Sincerely, > > > Gonzalo Rojas Costa >