FIND-CENTROID

Determines the ``center of gravity'' of the emission in the current spectrum within the nominated frequency or velocity interval. Probably ``centroid'' is not quite the right word, but it is the one commonly used and I will be guided by my peers.

Relevant flags:

N_INTS	I4	Number of intervals to use for analysis.
BLF_INTS	R4	Pairs of channels defining spectral intervals to be used for baseline fitting, analysis etc..

Examples:

    >> find-centroid<CR>
    Type intervals, one at a time, CTRL(Z) to finish
    Current units are km/s  

    # -10 10<CR>

    Quadrant 1 : Centroid is at    5.86 km/s