RMS noise for each of the ¹²CO J = 1− 0, ¹²CO J = 2− 1, and ¹³CO J = 1− 0 maps. All images are in the same colour scale, and the units in the colour bar are in Kelvin. Overlaid are the radio contours at 1420 MHz in units of brightness temperature at 4.8, 5.0, 5.5, and 6.0 K. The uneven rms values throughout our maps are due to us observing in many different weather and source elevation conditions.