Grad.h
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	// header guard
	#ifndef GRAD_H
	#define GRAD_H

	//include
	#include <iostream>
	#include <string.h>
	#include "structure.h"
	#include <math.h>

	/ for both gradient and second derivatives /
	struct point rotateCoordinateSystem(struct point P, double theta);

	/ gradient /
	struct point module_potentialDerivatives_totalGradient(const int Nlens, const struct point pImage, PotentialSet *lens );
	struct point grad_halo_sis(const struct point pImage, int iterator,PotentialSet lens);
	struct point grad_halo_piemd(const struct point pImage, int iterator,PotentialSet lens);

	/ PIEMD /
	complex piemd_1derivatives_ci05(double x, double y, double eps, double rc);

	/ Potential /
	void module_readParameters_calculatePotentialparameter(Potential *lens);

	// end header guard
	#endif