Normalises the sum of the X particle size classes
in tri.data to text.sum (100%).
TT.normalise.sum.X(tri.data, text.sum = NULL, text.tol = NULL,
tri.pos.tst = NULL, residuals = FALSE)
Julien Moeys [aut, cre], Wei Shangguan [ctb], Rainer Petzold [ctb], Budiman Minasny [ctb], Bogdan Rosca [ctb], Nic Jelinski [ctb], Wiktor Zelazny [ctb], Rodolfo Marcondes Silva Souza [ctb], Jose Lucas Safanelli [ctb], Alexandre ten Caten [ctb]