  The TOTEM collaboration has measured the elastic proton-proton differential
cross section ${\rm d}\sigma/{\rm d}t$ at $\sqrt{s}=13$ TeV LHC energy using
dedicated $\beta^{*}=90$ m beam optics. The Roman Pot detectors were inserted
to 10$\sigma$ distance from the LHC beam, which allowed the measurement of the
range $[0.04$ GeV$^{2}$$; 4 $GeV$^{2}$$]$ in four-momentum transfer squared
$|t|$. The efficient data acquisition allowed to collect about 10$^{9}$ elastic
events to precisely measure the differential cross-section including the
diffractive minimum (dip), the subsequent maximum (bump) and the large-$|t|$
tail. The average nuclear slope has been found to be $B=(20.40 \pm 0.002^{\rm
stat} \pm 0.01^{\rm syst})~$GeV$^{-2}$ in the $|t|$-range $0.04~$GeV$^{2}$ to
$0.2~$GeV$^{2}$. The dip position is $|t_{\rm dip}|=(0.47 \pm 0.004^{\rm stat}
\pm 0.01^{\rm syst})~$GeV$^{2}$. The differential cross section ratio at the
bump vs. at the dip $R=1.77\pm0.01^{\rm stat}$ has been measured with high
precision. The series of TOTEM elastic pp measurements show that the dip is a
permanent feature of the pp differential cross-section at the TeV scale.
