toroidat_coord.c running 
a=1.00 

changing sigma
theta=1.00, sigma= 0.00, phi= 0.00, Xc=  2.164, Yc=  0.000, Zc=  0.000 
theta=1.00, sigma= 0.20, phi= 0.00, Xc=  2.087, Yc=  0.000, Zc=  0.353 
theta=1.00, sigma= 0.50, phi= 0.00, Xc=  1.766, Yc=  0.000, Zc=  0.720 
theta=1.00, sigma= 1.57, phi= 0.00, Xc=  0.762, Yc=  0.000, Zc=  0.648 
theta=1.00, sigma= 3.14, phi= 0.00, Xc=  0.462, Yc=  0.000, Zc=  0.000 
theta=1.00, sigma=-1.57, phi= 0.00, Xc=  0.762, Yc=  0.000, Zc= -0.648 
theta=1.00, sigma=-0.50, phi= 0.00, Xc=  1.766, Yc=  0.000, Zc= -0.720 
theta=1.00, sigma=-0.20, phi= 0.00, Xc=  2.087, Yc=  0.000, Zc= -0.353 

changing phi
theta=1.00, sigma= 0.00, phi= 0.00, Xc=  2.164, Yc=  0.000, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 0.20, Xc=  2.121, Yc=  0.430, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 0.50, Xc=  1.899, Yc=  1.037, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 1.57, Xc=  0.000, Yc=  2.164, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 3.14, Xc= -2.164, Yc=  0.000, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 4.71, Xc= -0.000, Yc= -2.164, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 5.78, Xc=  1.899, Yc= -1.037, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 6.08, Xc=  2.121, Yc= -0.430, Zc=  0.000 

changing theta
theta=4.00, sigma= 0.00, phi= 0.00, Xc=  1.037, Yc=  0.000, Zc=  0.000 
theta=3.00, sigma= 0.00, phi= 0.00, Xc=  1.105, Yc=  0.000, Zc=  0.000 
theta=2.00, sigma= 0.00, phi= 0.00, Xc=  1.313, Yc=  0.000, Zc=  0.000 
theta=1.00, sigma= 0.00, phi= 0.00, Xc=  2.164, Yc=  0.000, Zc=  0.000 
theta=0.90, sigma= 0.00, phi= 0.00, Xc=  2.370, Yc=  0.000, Zc=  0.000 
theta=0.70, sigma= 0.00, phi= 0.00, Xc=  2.973, Yc=  0.000, Zc=  0.000 
theta=0.50, sigma= 0.00, phi= 0.00, Xc=  4.083, Yc=  0.000, Zc=  0.000 

changing theta and phi, sigma just changes z
theta=1.10, sigma= 0.00, phi= 0.10, Xc=  1.988, Yc=  0.199, Zc=  0.000 
theta=1.20, sigma= 0.00, phi= 0.20, Xc=  1.825, Yc=  0.370, Zc=  0.000 
theta=1.30, sigma= 0.00, phi= 0.30, Xc=  1.671, Yc=  0.517, Zc=  0.000 
toroidat_coord.c finished