Numerical model of the stress T_x(x,y) in a panda fiber, without the circular core, not to be blinded by the significant isotropic stress that this one generates: (a) color code with, in addition, double arrows to better visualize the stresses; (b) curve T_x(0,y) of the variation of the stress on the x-axis, along the y-axis: it is positive in the core region, and it becomes negative at a distance that corresponds to about the height of the SAPs.