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	Figure 1: The distribution of MV for 166 Hipparcos single K0V stars calculated from parallax and V magnitude neglecting the interstellar extinction, binned to 0.25 mag intervals.
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In the text

	Figure 2: The dependence of MV on parallax for 126 Hipparcos single K0V stars with MV>4.5 mag. The mean and its scatter in parallax bins is shown with the triangles. See text for details.
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In the text

	Figure 3: Magnitude distribution of the 126 Hipparcos single K0V stars with MV>4.5. The scale of the vertical axis is logarithmic and the labels indicate the beginning of a bin 0.25 mag wide. The linear envelope of the bright side indicates that the sample is complete up to V=9.
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In the text

	Figure 4: The resulting sample of 45 K0V stars with MV>4.5 and V<9. The triangles indicate the mean MV and its scatter in the same parallax bins as in Fig. 2. The solid line is the theoretical bias curve (1) fitted to the data. The magnitude limit at V=9 is shown by the straight line.
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In the text

	Figure 5: Comparison of the mean absolute magnitudes, and , calculated from the unbiased plateau for the two samples of Hipparcos K0V stars. The means derived for single stars only are shown by the continuous lines. The dashed lines give the magnitudes computed for all stars.
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In the text