Observations such as the one in CARMA are tagging by time, and map portions of the sky at a number of frequencies. As such the concept of understanding gridding coordinates becomes important how ``pixels'' are labeled. Are they using the center, or are they using the start of a interval/pixel/voxel... This section will clarify the conventions in MIRIAD. In FITS, an astronomy standard to exchange data, the convention is always the center of the pixel/interval, as long as the FITS keyswords NAXISn, CRVALn, CDELTn, CRPIXn, CTYPEn are involved.