The events are available as the acceptance corrected Dalitz plot.

The particles are counted as 1- pi, 2-eta, 3-pi and the data are given as:

1752

s12 s23 s13 Fraction_of_cell_area Events Error Number of cells

s12 s23 s13 Fraction_of_cell_area Events Error Number of cells

……………..

Only half of the Daltz plot is given. If the number of cells =2, then the cell should be taken twice with permutation of pions. If the number of cells=1, the cell is on the diagonal and

must be taken only once.

The s12, s23 and s13 are invariant energies squared of the two meson system (MeV²)

and Fraction_of_cell_area is the ratio of cell area to the area of the largest cell.

For these data Fraction_of_cell_area=1: all cells at the boundary are removed.

The background level for these events is less then 1%.

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