rvsao. emsao Cursor Commands

?

Print list of emsao cursor commands.

a

Set redshift guess from an absorption line at the cursor position. Respond to the prompt with either the line name from the ablines.dat file or a specific wavelength, which doesn't have to be one of the tabulated lines, in Angstroms. It might help to set the smoothing to 0 using g before doing this.

b

Set blue limit of spectrum to be searched to current cursor position.

c

Set the continuum order. (2.1)

d

Replaces a region between the marked vertical cursors with interpolated values from the edges of the marked region. This is typically used to eliminate poorly subtracted night sky lines or emission lines. x can be used to cancel the first d.

e

Set redshift guess from an emission line at the cursor position. Respond to the prompt with either the line name from the ablines.dat file or a specific wavelength, which doesn't have to be one of the tabulated lines, in Angstroms. It might help to set the smoothing to 0 using g before doing this.

f

Refit the redshift. If lines have been added or deleted, a new weighted mean is computed. If a new initial guess has been set or line fitting parameters have been modified, a new line search is done.

g

Change number of times spectrum is smoothed (nsmooth) to the number given in response to prompt. It may help to set this to 0 before identifying emission or absorption lines using e or a.

i

Reset the initial velocity for the line search.

k

Toggle between display with continuum subtracted and display with continuum included (default). This works when emsao.dispmode is 1 or 2. (2.1)

l

Reset the parameters for the number of standard deviations above the continuum at which to define an emission line and the wavelength to search around the redshifted center of an individual line.

m

Reset the number of times to smooth the spectrum before fitting the emission lines. This should only be changed from zero if the spectrum is very noisy.

n

Disaprove the final velocity and set the quality flag to X.

p

Replot the current display.

q

Quit and exit.

r

Set red limit of spectrum to be searched to current cursor position.

s

Force the final velocity to a specific value which may be

c the combination velocity as computed by emsao,

e the emission line velocity,

x the cross-correlation velocity as read from the spectrum header,

l an emission line velocity set manually be selecting the peak of an emission line using the e command or the nadir of an absorption line using the a command. The name and velocity of the line are saved in the VELSET header keyword.

g the initial guess as set by emsao.vel_init, or a or e, if either has been used on this spectrum,

s a specific velocity and error to be typed in.

Set redshift guess from entered rest wavelength for cursor position.

t

Use the velocity from the nth template in the list displayed in a emsao.dispmode=1 summary display.

u

Forces a replot of the current spectrum at the original scale.

v

Select the source of the redshift at which the absorption and emission lines are plotted. It may be an emission e, correlation x, or combined c radial velocity read from the image header as CZEM (or just computed), CZXC, or VELOCITY (or computed from current emission velocity and CZXC.

w

Show rest and observed wavelength at cursor position.

x

Plot the cross-correlation summary if it is available; otherwise, exit.

z

Replots the region of the spectrum in wavelength between successive uses. . can be used to cancel the first z.

/

Toggle between full screen display (emsao.dispmode=2)summary display. and summary display (emsao.dispmode=1).

+

Add closest found emission line to the velocity fit if it has been dropped, overriding program's selection criteria. If this doesn't work, use the v command to plot using the emission velocity.

-

Drop closest found emission line from the velocity fit if it has been used, overriding program's selection criteria. If this doesn't work, use the v command to plot using the emission velocity.

.

Cancel delete (d) or zoom (z) command.

@

Make hard copy of graph to plotter.

?

Print menu of one line descriptions of cursor commnads on the terminal.

[rvsao] [emsao]

Last updated 29 July 1999 by Doug Mink dmink@cfa.harvard.edu