Documentation

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Area Coverage	332${}^{\circ }$ $<l<$ 10${}^{\circ }$, $\left|b\right|<$ 2${}^{\circ }$
	358${}^{\circ }$ $<l<$ 4${}^{\circ }$, 2${}^{\circ }$ $<b<$ 6${}^{\circ }$
Observed frequency bands	1612, 1666, 1720 MHz
Raw beam FWHM	12.6, 12.4, 12.2 arcmin
Main beam gains	1.22, 1.25, 1.29 Jy/K
Raw bandwidth per frequency band	8 MHz
Raw frequency channel width	0.977 kHz
Brightness temperature scale	Main beam
Absolute calibration uncertainty	$\sim 5\%$ (assumed uncertainty on 1934$-$638 flux density model).
Gridding kernel Gaussian FWHM	10 arcmin
Gridding kernel cutoff diameter	20 arcmin
Pixel size	3 arcmin
Effective beam FWHM	$15.5\pm 0.2$, $15.4\pm 0.3$, $15.3\pm 0.2$ arcmin
Spectral line rest frequencies	1612.231, 1665.402, 1667.359, 1720.530 MHz
Raw velocity channel width	0.18, 0.18, 0.18, 0.17 km s$-1$
Gridded velocity channel width	0.36, 0.35, 0.35, 0.34 km s$-1$
Gridded velocity resolution	$\sim 0.9$ km s$-1$
LSRK velocity coverage	$\pm 300$ km s$-1$
Maximum velocity error at band edges	$\mp 0.14$ km s$-1$
Mean spectral rms noise	15 mK (12–20 mK over 95% of the survey area)
Spectral baseline fidelity (excluding CMZ & GC)	$\lesssim 20$ mK over 95% of positions
Continuum frequency bands	1612, 1666, 1720 MHz
Estimated continuum uncertainty	$\lesssim$ 2%
CMB and diffuse background included?	Yes