Commands are entered as a single character at the keyboard:
Left-Button Left mouse button flags the nearest visibility. Right-Button Right mouse button causes BLFLAG to precede to the next baseline. <CR> Carriage-return gives help. ? Help. a Flag nearest visibility (same as left mouse button). c Clear the flagging for this baseline and redraw plot. h Give help (same as carriage return). p Define a polygonal region, and flag visibilities within this region. Define the vertices of the polygon by moving the cursor and then hitting the left mouse button (or a). Finish defining the polygon by hitting the right mouse button (or x). You can delete vertices with the middle mouse button (or d). q Abort completely. This does not apply flagging. r Redraw plot. u Unzoom. x Move to next baseline (same as right mouse button). z Zoom in. You follow this by clicking the mouse on the left and right limits to zoom.
time (the default for the X axis) lst Local apparent sidereal time. uvdistance sqrt(u**2+v**2) hangle (hour angle) channel (implies nofqav) amplitude (the default for the Y axis) phase real imaginary rms Theoretical rms noise.
If axis = uvdistance [kilo-lambda; 2 values] If axis = time [dd,hh,mm,ss.s; 8 values] If axis = amplitude, real, imag [natural units; 2 values] If axis = phase [degrees; 2 values] If axis = hangle [hh,mm,ss.s; 6 values] If axis = rms [flux units; 2 values] If axis = lst [decimal hours; 2 values] If axis = freq [GHz; 2 values]
For axis types other than 'time' or 'hangle', one or other of the limits may be set with the other self-scaled by specifying the lower limit as 'min' and the upper as 'max' (or simply omitting it). For example,
self-scales the lower limit while pinning the upper limit to zero, whereas either of the following
set the lower limit to zero while self-scaling the upper limit.
Default is to self-scale both limits.
nobase Normally BLFLAG plots a single baseline at a time. This option causes all baselines to be plotted on a single plot. selgen Generate a file appropriate for selecting the bad data (via a "select" keyword). The output is a text file called "blflag.select". noapply Do not apply the flagging. rms When processing spectra, blflag normally plots the mean value of the spectra. Using options=rms causes it to plot the rms value instead. scalar When processing spectra, blflag normally forms an average value by vector averaging. This option causes it to generate the scalar average. It should be used with significant caution. nofqaver Do not average spectra - the resulting number of points may be too large to handle. Use select to break up the data in time ranges or use yrange to exclude noise.The following options can be used to disable calibration.
nocal Do not apply antenna gain calibration. nopass Do not apply bandpass correction. nopol Do not apply polarisation leakage correction.
flag.for,v 1.5 2011/06/01 04:51:00 pteuben Exp $