JaeSub Hong, 2003-2005
Please report any problem or suggestion at jaesub@head.cfa.harvard.edu
Refer to 
	J. Hong, E.M. Schlegel & J.E. Grindlay, 
	2004 ApJ 614 p508 and references therein
 
----------------------------------------------------------------------
Quantile analysis routines: 
	2 independent platforms are available - perl & IDL
	(C version in future)

perl: 
	quantile.pl : quantile calculator
	src.txt : example src file
	bkg.txt : example bkg file

	grid.pl : quantile grid generator (requires sherpa)
	grid.sl : a sherpa-slang file required for grid.pl

	example.rmf : example rmf file
	example.arf : example arf file
	example_powerlaw_grid.rdb : example grid (powerlaw)
	example_bremss_grid.rdb   : example grid (thermal bremss)

IDL: 
	quantile.pro: quantile calculator
     	example.pro: example of using quantile.pro

	plot_grid.pro: an example routine to plot the grid pattern
	rdrdb.pro: RDB file reader for plot_grid.pro

----------------------------------------------------------------------
Version History

ver 1.7: Mar 2005
	quantile.pl
		- add source and bkg value selection routine
			use only the values within the given range
		- add QDx, QDy and their errors for the output
			(require option -qccd)
		- apply various corrections for error by default (-fixerror)
			in order to remove these corrections, use -nofixerror
		- nip default value is now 2000

	quantile.pro
		- change fixerror to nofixerror
		- nip default value is now 2000
		- change err_qt => err_Ex
		- add Qx, err_Qx
		- add QDx, QDy and their errors for the output
			(require option /qccd)

	grid.pl
		- output format changes
			the column names
			E0, E1, E2,.. => E25, E50, E75,...
			i.e. Ex where x is frac*100.
	qdplot.pro
		- routines for plotting QCCD
	
	example.pro
		- now from sample calculation to plotting

	default error correction
		error for QDy : 0.8
		*sqrt(1+(n_src-n_net)/n_src)
		1/(1.+0.5/(n_net>1.))

	[known bug]
	- all the input values are identical,
			estimated errors are not meaningful
	- when estimation fails, try increase nip value
		

ver 1.6: Feb 2005
	- A bug fix in quantile.pl
		If multiple identical x values crash interpolations, 
		Add "simplify" function to remove mutiple x values except
		for two bounding values and correct interpol routine.

ver 1.5: Nov 2004
	Now comes with a grid generator (grid.pl, grid.sl).
	By modeling spectra with sherpa, grid.pl calculates a series of
	quantile values, which can be used to generate grid patterns of
	quantile color-color diagram for a given detector response.

	minor correction added : grid points are more evenly distributed now

ver 1.2: Aug 2004
	Minor bug fix

ver 1.1: Feb 2004
	Bug fix for $n_net < 1.0
	More output : src, bkg and net counts, and ratio
	fix a bug: the range option uses ":" for separator 
		e.g) -range x.x:y.y

ver 1.0: Nov 2003
	Initial release

----------------------------------------------------------------------
Future plan

	1. Advanced routines for quantile and error calculation

	2. C version : 
		do we really need this? 
		well, compiling is so pain in the a...

		Oh, Lord! Grant me patience.  
		And uuuh, please, hurry.