Radial dependences of (a) M_FUV and (b) ﹩( \mathrm{FUV}\,-V) _{0}﹩ color for M87 clusters; r is the distance from the galaxy nucleus. We use different symbols for clusters in different fields: filled circles are for field 1, squares are for field 2, triangles are for field 3, and open circles are for field 4. The arrows at the top of the plot indicate the field center for each field. The dashed line at ﹩r=17﹩ is drawn to separate the clusters in other fields from those in field 4, for which the total integration time was considerably shorter. The magnitude trend in field 4 is probably a selection effect caused by the bright diffuse background.