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#define SPATIAL_DETERMINANT(gxx_,gxy_,gxz_,gyy_,gyz_,gzz_) \
(-(gxz_)**2*(gyy_) + 2*(gxy_)*(gxz_)*(gyz_) - (gxx_)*(gyz_)**2 - (gxy_)**2*(gzz_) \
+ (gxx_)*(gyy_)*(gzz_))
#define DOTP(gxx_,gxy_,gxz_,gyy_,gyz_,gzz_,x1_,y1_,z1_,x2_,y2_,z2_) \
( (gxx_)*(x1_)*(x2_)+(gyy_)*(y1_)*(y2_)+(gzz_)*(z1_)*(z2_)+ \
(gxy_)*( (x1_)*(y2_)+(y1_)*(x2_) )+(gxz_)*( (x1_)*(z2_)+(z1_)*(x2_) )+\
(gyz_)*( (y1_)*(z2_)+(z1_)*(y2_) ) )
#define DOTP2(gxx_,gxy_,gxz_,gyy_,gyz_,gzz_,x_,y_,z_) \
( (gxx_)*(x_)**2+(gyy_)*(y_)**2+(gzz_)*(z_)**2+ \
2.0*( (gxy_)*(x_)*(y_)+(gxz_)*(x_)*(z_)+(gyz_)*(y_)*(z_) ) )
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