Table 1: Amplitudes (in mag) and phases (in rad) of the frequencies $\nu _1$ = 4.7126 d-1, $.\!\!^{\rm d}$ = 2.2342 d-1 and $\nu _3$ = 4.671 d-1 calculated from the uvby time-series of V2104 Cyg by means of a triperiodic least-squares fit. For each filter the mean magnitude difference is given together with the rms, of the residuals. The last row indicates the calculated (S/N=4)-level at $\nu _3$ = 4.671 d-1. Phase = 0 corresponds to T0= 2 453 647.3034.
        u light   v light   b light   y light
Term   Freq.   Ampl. Phase   Ampl. Phase   Ampl. Phase   Ampl. Phase
    [d-1]   [mag] [rad]   [mag] [rad]   [mag] [rad]   [mag] [rad]
$\nu _1$   4.7126   0.0086 0.17   0.0073 0.26   0.0071 0.25   0.0071 0.27
    $\pm$.0004   $\pm$.0004 $\pm$.09   $\pm$.0002 $\pm$.04   $\pm$.0002 $\pm$.04   $\pm$.0002 $\pm$.05

$\nu_2$

   2.2342   0.0098 5.41   0.0059 5.31   0.0058 5.28   0.0051 5.28
    $\pm$.0005   $\pm$.0005 $\pm$.05   $\pm$.0002 $\pm$.03   $\pm$.0002 $\pm$.04   $\pm$.0002 $\pm$.04

$\nu _3$

   4.671   0.0026 6.2   0.0024 6.1   0.0024 6.1   0.0024 6.2
    $\pm$.001   $\pm$.0004 $\pm$.3   $\pm$.0002 $\pm$.1   $\pm$.0002 $\pm$.1   $\pm$.0002 $\pm$.2

Mean $\Delta$m (A0)		   $0.7054\pm .0003$   $1.3398\pm .0001$   $1.4610\pm .0001$   $1.5124\pm .0001$
Residual rms [mag]   0.0065   0.0025   0.0026   0.0028

S/N=4 @$\nu _3$		   0.0038   0.0022   0.0022   0.0019

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