Task: opplt Purpose: Plot opacity and sky brightness. Categories: miscellaneous Opplt plots model opacity and atmospheric brightness temperatures given site information. These quantities can be plotted as a function of frequency or elevation. To plot as a function of frequency, give two values for the freq key and one for the el key. To plot as a function of elevation, give two values for the el key and one for the freq key. You must give two values for either freq or el. Key: freq Frequency range of interest, in GHz. One or two values can be given. If two values are given, then the plot is as a function of frequency, and the values are the limits for the plot. The default is 22 GHz. Key: el Elevation angle, in degrees. One or two values can be given. If two values are given, then the plot is as a function of elevation, and the values are the limits for the plot. The default is 90 degrees (i.e. zenith). Key: device Plot device. Default is not to plot anything. Key: log Output log file. The default is not to create one. Key: options Extra processing options. Currently there is only a single option. airmass When plotting as a function of elevation, express the x-axis as cosec(elevation), which is also known as the airmass. Key: t Temperature, in Kelvin. Default is 300. Key: z Observatory altitude, in m. Default is 200 (i.e. the altitude of Narrabri). Key: p Sea-level atmospheric pressure, in hPa (i.e. millibars). The default is 1013 hPa. Key: h Relative humidity, as a percentage. The default is 20%.

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