Task: zeestat Purpose: Fits Zeeman parameters to I and V cubes Categories: model fitting ZEESTAT is a Miriad task that fits Zeeman parameters to a region of input I and V cubes. Zeestat also analyses the noise correlations to determine a factor used in correcting the sigma estimates. Key: iin Input I cube in vxy order. Wild card expansion is supported. No default. Key: vin Input V cube in vxy order. Wild card expansion is supported. No default. Key: beam The beam of the observation. This is used in determining the sigma correction factor. The default is a delta function. You should give the beam if you want an accurate estimate of sigma. Wild card expansion is supported. Key: rho The channel-to-channel correlation coefficient. This is used in determining the sigma correction factor. The default is 0. Key: freq Frequency (GHz) of splitting. No default. Key: mode This is a character string that determines the algorithm used in the fitting process. It consists of several flags, which can be: m Use maximum likelihood technique. l Include a leakage term in the fitting. 2 Use a two sided derivative estimate. x Perform extra checks for better solutions when using the maximum likelihood technique. The default is ' ' i.e., least squares and 1. Key: aveop If 'a' then the spectra specified by the spatial window are averaged before being passed to the fitting routine. Otherwise, and by default, all spectra are passed to the fitting routine and "spatial summing" (as defined by SKLZ) is performed. Key: chan Channel range. Default is all channels. Key: blc Bottom left corner of spatial region to examine. Default is (1,1). Key: trc Top right corner of spatial region to examine. Default is all of image. Key: log This is the name of an output logfile, which shows how the error estimate varies with the alpha parameter. Key: out Output results to this file as well as screen

Generated by miriad@atnf.csiro.au on 21 Jun 2016