Filling a leaf of a Tree with Random


I’ve created a simple tree that has 3 variable leaves: x, y, z.
I am trying to fill each leaf with a different number assortment.
example: leaf x is filled with 1000 events of random Gaussian distribution, y is filled with a uniform distribution, and z is filled with a Landau distribution.
How do I fill each leaf individually?
I cannot access it through:


Fill the tree, not the leaves or branches. Generate three random numbers for every event, assigning to x, y and z, and fill the tree with that event. See examples here for generation or numbers:
Using for instance TRandom3:

TRandom *r3 = new TRandom3();
for (i=0;i<1000;i++) {
   x = r3->Gaus(0,1);
   y = ...;
   z = ...;
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