  The ISR and the 7 TeV LHC data indicate that the differential cross-section
of elastic proton-proton scattering remains almost energy-independent at the
transferred momentum $t\approx - 0.21\, \mathrm{GeV}^{2}$ at the level of
$\approx 7.5 \mathrm{\ mb}/\mathrm{GeV}^{2}$. This property of $ d\sigma/dt$
(the "first" stationary point) appears due to the correlated growth of the
total cross-section and the local slope parameter and can be expressed as a
relation between the latter quantities. We anticipate that this property will
be true up to 13 TeV. This enables us to normalize the preliminary TOTEM data
for $ d\sigma/dt$ at 13 TeV and $ 0.05 < |t| < 3.4\, \mathrm{GeV}^{2}$ and
predict the values of $ d\sigma/dt$ at this energy. These data give an evidence
of the second stationary point at $t\approx - 2.3\,\mathrm{GeV}^{2}$ at the
level of $\approx 33 \mathrm{\ nb}/\mathrm{GeV}^{2}$. The energy evolution of $
d\sigma/dt$ looks as if the high energy elastic scattering amplitude is a sum
of two similar terms. We argue that the existence of the two stationary points
and the two-component structure of the high energy elastic scattering amplitude
are general properties for all elastic processes.
