...

Present address: Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile.

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...1992)

The Australia Telescope is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.

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... cube

Note that the "standard'' procedure for the production of "moment maps'' is to smooth the original data cube and use a user-defined flux-density threshold in that smoothed version as a "mask'' to circumscribe features that are considered to be real emission, while data points below the threshold are blanked. In this process, the signal-to-background ratio of the moment maps is increased significantly. However, since features below a certain threshold are removed systematically, there is no measure any more of the inherent thermal noise of the data. Such blanked moment maps will be shown below. Here, in the display of the total FOV, we want to present an image including the true noise of the data, especially in the region of particular interest, between NGC1792 and NGC1808.

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