  The spectrum of radially excited unflavored vector mesons is relatively well
measured, especially in the heavy-quark sector. This provides a unique
opportunity to observe the behavior of the hadron spectrum at fixed quantum
numbers as a function of the quark mass. The experimental data suggests the
approximately Regge form for the radial spectrum, M_n^2=An+B, where A and B are
growing functions of the quark mass. We use the bottom-up holographic approach
to find the functions A and B. The obtained result shows a good agreement with
the phenomenology and consistency with some predictions of the Veneziano-like
dual amplitudes.
