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SPACING indicates the step (and implicitely the contour levels) for contouring and/or greyscale. SPACING[1] control the values, and SPACING[2] the Unit of these values. It can be UNITS (default data cube units), NOISE or SIGMA (noise level), Jy (which also stands for Jy/Beam) and its sub-units mJy (or milliJy) and microJy, or K and its sub-units mK (or milliK) or microK.
Jy (and its sub-units) is taken as equivalent to Jy/Beam, and automatic conversion between brightness unit (K) and flux unit (Jy/Beam) is made when the data cube has a specified angular resolution and frequency.
SPACING[1] = 0 means an automatic guess of the contours from the Min and Max of the data cube.
The type of spacing is controlled by variable SPACE_TYPE.