Previous experiments have used various cuts in phase space in order (i)
to identify the individual contributions IB, SD
, INT
as
far
as
possible, and (ii) to reduce the background from 
decays. This
background has in fact forced so severe cuts that only the upper end of the
lepton spectrum remained.
The experimental possibilities to reduce background from 
decays are
presumably more favourable with today's techniques. Furthermore, the
annual yield of 
decays at DA
NE is more than two orders
of
magnitude higher than the samples which were available in
[4,5,7,8].
This allows for a big improvement in the determination
of the amplitudes A and V, in particular in 
decays.
It would be very interesting to pin
down the
combination 
of the low-energy constants which occur
in the chiral representation of the amplitude A and to
investigate the 
-dependence of the form factors.