' ' Hitting the key will return the location of the cursor in both wavelength and pixel space. The form of the output is: wave=XXXXX pixel=XXXXX ':' Start a colon command. See below for list of colon commands. 'a' Plot all the spectra. The observational spectrum, the predicted artificial spectrum, and the located artificial spectrum are all plotted. A key on the right of the graph indicate what type of line corresponds to each spectrum. 'b' Plot both artificial spectra. Both the predicted and located artificial spectra are plotted, omitting the observational spectrum. A key on the right of the graph indicites what type of line corresponds to each spectrum. 'g' Get information on the line whose located position is nearest the graphics cursor. The following message is returned: line xxxx located at pixel xxx wavelength xxxx where 'line xxxx' is the line's known wavelength 'pixel xxx' is the pixel position of the line 'wavelength xxx' is the wavelength of that pixel as determined by the provided wavelength solution 'i' Identify a line. The use of the 'i' key is a three step process. It is best to use the 'i' key when the observed spectrum and predicted line spectrum are plotting simultaneously, (see the 'p' key'). The first time the 'i' key is hit, instructions on the use of the 'i' key are printed: Select observed feature to identify Place the graphics cursor on a feature in the observed spectrum that will be identified, then hit the 'i' key again. The following instruction is printed: Select line associated with feature Place the graphics cursor on the feature in the predicted spectrum and hit the 'i' key again. The selected feature will be associated with the selected line, determining a new zero-point offset. The locating phase will then re-execute, determining new locations for lines. The zero-point offset calculated can be queired using the "offset" colon command. 'l' Plot the observational spectrum and the located artificial spectrum. A key to the right of the plot indicates which plot refers to which spectum. 'n' Next spectrum. The accept the line locations found for the current spectrum and start processing the next. This is the same functionality as the 'q' and EOF keys. 'p' Plot predicted and observed spectra. A key to the right of the graph indicates which line type corresponds to which spectrum. 'q' Next spectrum. The accept the line locations found for the current spectrum and start processing the next. This is the same functionality as the 'n' and EOF keys. 'r' Redraw. Simply redraw the graphs. 's' Silent. Accept the line locations of the current spectrum and end interactive mode. If there are more spectra to be processed, they will be done without graphics interaction. 'w' Execute the gtool windowing options. Refer to the help for 'gtools' for more information. The next key may be one of the following: 'a' Autoscale x and y axes. 'b' Set bottom edge of window. 'c' Center window at cursor position. 'd' Shift window down. 'e' Expand window (mark lower left and upper right of new window) 'f' Flip x axis. 'g' Flip y axis. 'j' Set left edge of window. 'k' Set right edge of window. 'l' Shift window left. 'm' Autoscale x axis. 'n' Autoscale y axis. 'p' Pan x and y axis about cursor. 'r' Shift window right. 't' Set top edge of window. 'u' Shift window up. 'x' Zoom x axis about cursor. 'y' Zoom y axis about cursor. 'z' Zoom x and y axes about cursor. 'x' Recalculate zero-point offset with cross correlation. EOF Next spectrum. The accept the line locations found for the current spectrum and start processing the next. This is the same functionality as the 'n' and 'q' keys. Below is the list of colon commands available. no_dups [yes/no] Show/change state of no_dups. If 'yes', only the "brightest" lines, as determined by the line list table, will be allowed at the same pixel location. If 'no', all lines located are allowed, despite the fact that some may be assigned to the same observed feature. With no argument, the current state is reported. offset [value] Show/set value of the zero-point offset. The units of the offset should first be set using the "units" colon command (see below). With no argument, the current offset is displayed. radius [value] Show/set number of pixels to search around the predicted pixel position for a feature. With no argument, the current value is displayed. sigma [value] Show/set value of sigma for artificially generated spectra. If an argument is provided, it is taken as the sigma of the gaussian used to create the artificial spectra based on the predicted/located positions of lines. With no argument, the current value is displayed. thresh [value] Show/set threshold for true observed features. If an observed emission has peak flux less than this value, it will not be used. With no argument, the current value is displayed. units [wavelength,pixel,sample] Show/set the units of the zero-point offset. The units should be set before the offset is specified with the "offset" colon command. With no argument, the current units are displayed. width [value] Show/set feature width size. With argument, reset feature width size. With no argument, report on current size. xcor [yes/no] Show/set whether cross-correlation should be used to find the initial zero-point offset. 'yes' will recalculate the zero-point offset before the lines are located. 'no' will use the offset specified by the "offset" command or the value specified initially in the "offset" task parameter. This command has no effect on the current spectrum; it will only effect subsequent spectra. With no argument, the current state will be displayed.