C60 and C70 carbon atom compounds are prepared by evaporating graphite in an inert quenching gas. A plurality of hydrotherapy jets are spaced apart along the vertical wall above the upper side of said bench and below the water line of the swimming pool. In cross section, the upper run has a lowermost portion and lateral portions diverging laterally and upwardly from the lowermost portion. The determined pressure difference is adjusted based on the determined direct pressure of the primary tire. Also, an influence of a reactive magnetic field produced by eddy current induced on a surface of the coin is detected by the receiving coil. The tunable filter exhibits a compact form factor and precise tuning to any selected wavelength of a predetermined set of wavelengths comprising a wavelength grid.