of each of our program clusters. All photometric data are corrected for extinction and reddening by application of the Schlegel, Finkbeiner, $\&$ Davis (1998) maps. The average reddening ($E(B-V)$) for stars in the direction of these clusters is 0.017, 0.110, 0.045, 0.041, 0.032 for M 13, M 15, M 2, NGC 2420, and M 67, respectively. Comparing with the literature values listed in Table 1, most of the average reddenings of the clusters agree within about 0.02 mags.

Spectroscopic Data
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The spectroscopy discussed in the present paper was obtained during the course of SEGUE tests and normal SEGUE observations. In normal SEGUE operation mode, a pair of plug-plates (referred to as the “bright” and “faint” plates) are obtained over the $3^{\circ}$ field of the ARC 2.5m. A total of 640 optical fibers are employed to obtain $R=2000$ spectra for on the order of 600 program stars for each plate (the remaining fibers are used for spectrophotometric and reddening calibration objects and observations of the night sky). The exposure time depends on observation conditions. For a bright plate, exposures are set to achieve a total $(S/N)^{2} >$ 15/1 from the two blue-side CCDs on the SDSS spectrographs; the exposure for 