Four observed HST STIS fields, superposed on a WFPC2 image of the inner region of M87. To remove the diffuse background, a median‐filtered image was subtracted from the original WFPC2 image. The entire field of view of the image is ﹩160^{\prime \prime }\times 160^{\prime \prime }﹩. Locations of the nucleus and optical jet of M87 are indicated. Most of the point sources shown in the figure are GCs. The centers of fields 1, 2, 3, and 4 are located at angular distances of 38^{﹩\arcsec﹩}, 73^{﹩\arcsec﹩}, 22^{﹩\arcsec﹩}, and 10^{﹩\arcsec﹩}, respectively, from the nucleus of M87.