We present an alternative analysis of the data reported by the
balloon-borne experiment RUNJOB.
According to RUNJOB, the average mass number of primary cosmic ray particles
is constant up to 1 PeV.
Here we show that there is more than one solution, which reproduce
the observational data.
It is demonstrated that, contrary to the wide-spread opinion, the RUNJOB
data are not inconsistent with
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