diag.c
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	#include<stdio.h>
	#include<math.h>
	#include<fonction.h>
	#include<constant.h>
	#include<dimension.h>
	#include<structure.h>

	/****************************************************************/
	/* nom: diag */
	/* auteur: Jean-Paul Kneib */
	/* date: 10/02/92 */
	/* place: Toulouse */
	/****************************************************************
	* Same as formeli() but return the inverse of a and b, the proper
	* magnification axis.
	*
	* Used in e_test()/e_mag() to define the arclet size in the image plane
	* from the source size in the source plane.
	*
	* Parameters :
	* - a : 1 - dxx(Phi)
	* - b : - dxy(Phi)
	* - c : 1 - dyy(Phi)
	*/
	struct ellipse diag(double a, double b, double c)
	{
	struct ellipse diago;

	diago = formeli(a, b, c);
	diago.a = 1 / diago.a;
	diago.b = 1 / diago.b;

	return (diago);
	}