;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
;
;*NAME:		pmas_spot
;
;*CATEGORY:	PMAS instrument control, focus utility
;
;*PURPOSE:	determine best focus
;
;*CALLING SEQUENCE:
;
;*PARAMETERS:
;	INPUT:  flist        string array with file names
;		x0,y0        coordinates of spot selected for analysis
;              
;	OUTPUT: sigma_d/_c   Gauss sigma in dispersion/cross dispersion
;		fwhm_c/_d    full width half max in disp/cross disp.
;
;	KEYWORDS: - none -
;		       
;*EXAMPLES:	 
;                         
;
;*SYSTEM VARIABLES USED:
;		- none -
;
;*COMMON BLOCKS:
;		- none -
;
;*INTERACTIVE INPUT:
;		- none -
;
;*SUBROUTINES CALLED:
;		polyfit
;		picky4x
;		dist_circle
;               sstring
;               fwhm
;
;*FILES USED:
;		- none -
;
;*SIDE EFFECTS:
;		
;
;*RESTRICTIONS:
;
;
;*NOTES:
;		 
;
;*PROCEDURE:
;
;
;*MODIFICATION HISTORY:
;
;	27/05/01	MMR	initial programming
;       15/05/02        mmr     plots improved, optional postscript output added
;          
;*AUTHORS:
;
;	MMR		Martin M. Roth	Astrophysikalisches Institut Potsdam
;					An der Sternwarte 16
;					D-14547 Potsdam  
;					Tel. +49 - 331 - 7499 313
;                                       email: mmroth@aip.de
;-