Table 1: Observation log of NGC 6253.
Date UT $_{\rm {beginning}}$ Exposure time Configuration Grating No. of stars

(s)

2004-04-07 07 31 40.549 2595 A CD3 7

2004-04-08 07 39 50.833 2595 B CD3 6

2004-04-06 08 34 34.455 2595 A CD4 7

2004-04-07 08 27 40.831 2595 A CD4 7

2004-04-08 08 37 19.858 2595 B CD4 6

**Table 1:** Observation log of NGC 6253.
Date	UT $_{\rm {beginning}}$	Exposure time	Configuration	Grating	No. of stars
		(s)
2004-04-07	07 31 40.549	2595	A	CD3	7
2004-04-08	07 39 50.833	2595	B	CD3	6
2004-04-06	08 34 34.455	2595	A	CD4	7
2004-04-07	08 27 40.831	2595	A	CD4	7
2004-04-08	08 37 19.858	2595	B	CD4	6

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