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The Optical Counterpart to the Accreting Millisecond X-Ray Pulsar SAX J1748.9-2021 in the Globular Cluster NGC 6440

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Figure

Figure 1. Finding charts of the counterpart to COM-SAX J1748.9-2021 (north is up and east is left)
Figure 2. Top: (m F606W , m F606W - m F814W ) differential-reddening-corrected CMD of NGC 6440
Figure 5. Reddening-corrected m ( F606W - m F814W 0 ) vs. m ( F606W - m F656N 0 ) color –color diagram of NGC 6440
Figure 6. Light curve of COM-SAX J1748.9-2021 (black circles and error bars ) obtained by folding the F606W measurements (top panel) and F814W measurements (bottom panel) with the binary system orbital parameters

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