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+? - This display                          r - Redraw the current window
+/ - Cycle thru short help on stat line    s - Smooth (boxcar)
+a - Autoexpand between cursors            t - Fit continuum(*)
+b - Toggle base plot level to 0.0         u - Adjust coordinate scale(*)
+c - Clear and redraw full spectrum        v - Velocity scale (toggle)
+d - Deblend lines using profile models    w - Window the graph
+e - Equiv. width, integ flux, center      x - Connects 2 cursor positions
+f - Arithmetic functions: log, sqrt...    y - Plot std star flux from calib file
+g - Get new image and plot                z - Expand x range by factor of 2
+h - Equivalent widths(*)                  ) - Go to next spectrum in image
+i - Write current image as new image      ( - Go to previous spectrum in image
+j - Fudge a point to Y-cursor value       # - Select new line/aperture
+k - Profile fit to single line(*)         % - Select new band
+l - Convert to F-lambda                   $ - Toggle wavelength/pixel scale
+m - Mean, RMS, snr in marked region       - - Subtract deblended fit
+n - Convert to F-nu                       , - Down slide spectrum
+o - Toggle overplot of following plot     . - Up slide spectrum
+p - Convert to wavelength scale           I - Interrupt task immediately
+q - Quit and exit                   <space> - Cursor position and flux
+
+(*) For 'h' key: Measure equivalent widths
+    a - Left side for width at 1/2 flux   l - Left side for continuum = 1
+    b - Right side for width at 1/2 flux  r - Right side for continuum = 1
+    c - Both sides for width at 1/2 flux  k - Both sides for continuum = 1
+
+(*) For 'k' key: Second key may be used to select profile type
+    g - Gaussian, l - Lorentzian, v - Voigt, all others - Gaussiank
+
+(*) For 't' key: Fit the continuum with ICFIT and apply to spectrum
+    / = normalize by the continuum fit
+    - = subtract the continuum fit (residuals)
+    f = replace spectrum by the continuum fit
+    c = clean spectrum of rejected points
+    n = do the fitting but leave the spectrum unchanged
+    q = quit without fitting or modifying spectrum
+
+(*) For 'u' key: Adjust the coordinate scale by marking features
+    d = apply doppler correction to bring marked feature to specified coord.
+    l = set linear (in wavelength) coordinates based on two marked features
+    z = apply zero point shift to bring marked feature to
+	specified coordinate
+
+The colon commands do not allow abbreviations.
+
+:# <comment>      - Add comment to log file
+:dispaxis <val>   - Change summing parameter for 2D images
+:log	          - Enable logging to save_file
+:nolog            - Disable logging to save_file 
+:nsum <val>       - Change summing parameter for 2D images
+:show	          - Show full output of deblending and equiv. width measurments
+:units <value>	  - Change coordinate units (see below)
+
+:label  <label> <format> - Add label at cursor position
+:mabove <label> <format> - Add tick mark and label above spectrum
+:mbelow <label> <format> - Add tick mark and label below spectrum
+    The label must be quoted if it contains blanks.  A label beginning
+    with % (i.e. %.2f) is treated as a format for the x cursor position.
+    The optional format is a gtext string (see help on "cursors").
+    The labels are not remembered between redraws.
+
+:auto [yes|no]    - Enable/disable autodraw option
+:zero [yes|no]    - Enable/disable zero baseline option
+:xydraw [yes|no]  - Enable/disable xydraw option
+:hist [yes|no]    - Enable/disable histogram line type option
+:nosysid [yes|no] - Enable/disable system ID option
+:wreset [yes|no]  - Enable/disable window reset for new spectra option
+:flip [yes|no]    - Enable/disable dispersion coordinate flip
+:overplot [yes|no]- Enable/disable permanent overplot mode
+
+:/help  Get help on GTOOLS options
+:.help	Get help on cursor mode options
+
+
+				UNITS
+
+The units are specified by strings having a unit type from the list below
+along with the possible preceding modifiers, "inverse", to select the
+inverse of the unit and "log" to select logarithmic units. For example "log
+angstroms" to plot the logarithm of wavelength in Angstroms and "inv
+microns" to plot inverse microns.  The various identifiers may be
+abbreviated as words but the syntax is not sophisticated enough to
+recognized standard scientific abbreviations except as noted below.
+
+	   angstroms - Wavelength in Angstroms
+	  nanometers - Wavelength in nanometers
+	millimicrons - Wavelength in millimicrons
+	     microns - Wavelength in microns
+	 millimeters - Wavelength in millimeters
+	  centimeter - Wavelength in centimeters
+	      meters - Wavelength in meters
+	       hertz - Frequency in hertz (cycles per second)
+	   kilohertz - Frequency in kilohertz
+	   megahertz - Frequency in megahertz
+	    gigahertz - Frequency in gigahertz
+	         m/s - Velocity in meters per second
+	        km/s - Velocity in kilometers per second
+	          ev - Energy in electron volts
+	         kev - Energy in kilo electron volts
+	         mev - Energy in mega electron volts
+		   z - Redshift
+
+	          nm - Wavelength in nanometers
+	          mm - Wavelength in millimeters
+	          cm - Wavelength in centimeters
+	           m - Wavelength in meters
+	          Hz - Frequency in hertz (cycles per second)
+	         KHz - Frequency in kilohertz
+	         MHz - Frequency in megahertz
+	         GHz - Frequency in gigahertz
+		  wn - Wave number (inverse centimeters)
+
+The velocity and redshift units require a trailing value and unit defining the
+velocity zero point.  For example to plot velocity relative to
+a wavelength of 1 micron the unit string would be:
+
+	km/s 1 micron