how to decrease the x-axis from left to right

Question

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plot option increses the axis from left to right. How can we reverse this (decrese the x-axis from left to right), something like shown in figure.

The code is attached herewith.

fc=-20*.145;
ft = -0.1*fc;
l = 0.52;
m = -( 3*(fc*fc-ft*ft)/(fc*ft))*(l/(l+1));
zita = fliplr(-50:1:5).*0.145;
theta = 0*(pi/180);
c = cos(theta);
p = 4*(1-l^2)*(c^2) + (2*l - 1)^2;
q = 2*(1-l*l)*c + (2*l-1)*sqrt(4*(1-l*l)*(c^2) + 5 *l*l - 4*l);
r =(p/q);
a = 1.5/(fc*fc);
b = m*r/((sqrt(6))*fc);
c = (m.*zita./(sqrt(3)*fc))-1;
rho = (-2*b + sqrt(b*b - 4*a.*c))./(4*a);
 
plot(-zita,rho);
grid on;