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Fig. 5

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Flux excess for the seven stars in our sample for which a clear flux excess is detected (i.e. γ Dra and σ Lib are excluded, since only upper limits are available). The observations (with the continuum already subtracted) are represented by asterisks. The lines show the linear least-squares fit to the data. In case of several measurements at one wavelength, the fluxes were replaced by a weighted average. Error bars are shown, but they often fall within the symbols for the fluxes. A triangle represents an upper limit. The full line is a fit to the data points excluding the upper limits. The slope of this fit is indicated by “slope”. The dashed line is a fit to the data points including the upper limits to demonstrate the influence of these points on the conclusions. The slope for this fit is indicated by “slopeUp”.

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