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ltcplot xray.xtiming


NAME · USAGE · DESCRIPTION · PARAMETERS · EXAMPLES · TIME_REQUIREMENTS
BUGS · SEE_ALSO

NAME

ltcplot - Graph a Light-curve Table

USAGE

ltcplot table

DESCRIPTION

LTCPLOT graphs the output file created from running task LTCURV . LTCPLOT has default parameters set to plot a histogram of Count Rate (cts/sec) vs. Time (secs) with error bars. The input is the root_ltc.tab file. Further customizations effecting titles, axes labels and tics, and plotting data subsets are available to the user. The iraf IGS plot commands are available to the user to further expand, zoom, and query the plot.

PARAMETERS

table = prompt = Input Table File

Table file to be plotted.

outplt = prompt = Plot output file

Filename of output plot. Required when parameter hdcopy is yes . This file is left in the user's directory after termination of this task. It can be reprinted using the STPLOT package SGIKERN task.

(column = "ctrt")

Column name of plot data. The name must be input as it appears in the table. The data corresponding to the column name is read from the table file and plotted.

(plot_type = "histo") [string]

Type of plot, either histo or bar . If plot_type is "histo" a histogram of the column data will be plotted. If the plot_type is "bar" the column data will be plotted as horizontal bars. Default is set to histo .

(ecolumn = "err") [string]

Column name of error data to be plotted. This is an option only if plot_type is "histo" and will appear as error bars on the graph. Ecolumn is the name of the error data associated with the column. The name must be input as it appears in the input table.

(plot_title = "Light Curve :") [string]

Title for plot.

(x_title = "Time (seconds)"") [string]

Title for X-axis.

(y_title = "Count Rate (cts/sec)") [string]

Title for Y-axis.

(hdcopy = no) [boolean]

yes prints a hardcopy of the plot to the printer and no displays the plot on the screen. Default is set to no .

(gclose = no) [boolean]

No leaves task in graphics window - type q to quit. Yes closes plot and returns to the cl. Default is set to no .

(num_plots = 1) [int]

Number of plot windows in which to display the data. Data will be evenly divided among the specified number of windows.

(x_units = "seconds") [string]

X-axis label. Default is seconds . Header parameters must be present for seconds to work. x_units will default to bin if header parameters are missing.

(x_tics = 4.) [real]

Number of tic labels on x-axis. This is the approximate number of tics and corresponding labels along the x-axis. The task chooses evenly spaced round numbers for labels and thus the actual number of labels may not be exactly that which was chosen.

(y_tics = 4.) [real]

Number of tic labels on y-axis. This is the approximate number of tics and corresponding labels along the y-axis. The task chooses evenly spaced round numbers for labels and thus the actual number of labels may not be exactly that which was chosen.

(label_size = 0.75) [real]

Plotting Header and axis labels format size. This is the size of the labels for the plot header and X & Y axis labels. The format is set to a reasonable size. Adjust this value by 1/10's to change the size of the labels.

(tlabel_size = 0.5) [real]

Strip plot tic label format size. This is the size of the labels on the axis tic marks. Small adjustments to this value dramaticly affect the size. This value should be decreased slightly (by 1/10's) when the number of plots is large and the labels run into adjoining plot windows.

(x_range = "auto") [string]

Either auto which will plot entire file length or a Range consisting of a min and max.

(y_range = "auto") [string]

Either auto which will plot all histogram values or a Range consisting of a min and max.

(clobber = no) [boolean]

Boolean flag specifying whether or not the plot file can be overwritten if it already exists (i.e. postscript plot file). Does not apply to window graphics. Used when hardcopy equals yes .

(cursor = "") [string]

Stores cursor commands taken in interactive graphics mode.

EXAMPLES

1. Plot a histogram of the count rate of light curve table snr_ltc.tab. The input file is the complete data set of xdata$snr.qp, and from this plot one can discern the 3 good time intervals and the gaps in the data set.


        xt> ltcplot
        Input Table File: snr_ltc

2. Plot the histogram as in example 1 but with more tic marks on the X-axis.

	xt> ltcplot.x_tics=8
	xt> ltcplot
	Input Table File: snr_ltc
3. Plot a histogram of the count rate of light curve table snr3_ltc.tab. Divide plotting area so that the data is shown over 5 strip plots. Don't plot the error bars.

        xt> ltcplot num_plots=5 ecolumn=""
        Input Table File: snr3_ltc

4. As in example 2 only in command line format.

	xt> ltcplot "snr3_ltc" num_plots=5 ecolumn=""

TIME REQUIREMENTS

BUGS

SEE ALSO

Documentation on making a light curve (help ltcurv)

Documentation on graphing timing tables (help timplot)

Documentation on graphics cursor commands (help cursors)


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