  High precision measurements of flow coefficients $v_{n}$ ($n = 1 - 4$) for
protons, deuterons and tritons relative to the first-order spectator plane have
been performed in Au+Au collisions at $\sqrt{s_{NN}} = 2.4$ GeV with the
High-Acceptance Di-Electron Spectrometer (HADES) at the SIS18/GSI. Flow
coefficients are studied as a function of transverse momentum $p_{t}$ and
rapidity $y_{cm}$ over a large region of phase space and for several classes of
collision centrality. A clear mass hierarchy is found for the slope of $v_{1}$,
$d v_{1}/d y^{\prime}|_{y^{\prime} = 0}$ where $y^{\prime}$ is the scaled
rapidity, and for $v_{2}$ at mid-rapidity. Scaling with the number of nucleons
is observed for the $p_{t}$ dependence of $v_{2}$ and $v_{4}$ at mid-rapidity,
which is indicative for nuclear coalescence as the main process responsible for
light nuclei formation. $v_{2}$ is found to scale with the initial eccentricity
$\langle \epsilon_{2} \rangle$, while $v_{4}$ scales with $\langle \epsilon_{2}
\rangle^{2}$ and $\langle \epsilon_{4} \rangle$. The multi-differential
high-precision data on $v_{1}$, $v_{2}$, $v_{3}$, and $v_{4}$ provides
important constraints on the equation-of-state of compressed baryonic matter.
