How to show equation or formula of Regression on matlab?

how to show the regression formula used when i plot the data? I tried to use axes but they still don't appear. Please help me.

hypodd.reloc

clc;
clear all;
data = load('hypodd.reloc');
x = data(:,3); % Long
y = data(:,2); % Lat
z = data(:,4); % Depth 
A = [x y ones(length(x),1)]; % independent variable
[cc,bint,r,rint,stats]= regress(z,A); % compile the regression formula
scatter3(x,y,z); % Plot hypocenter
hold on;
x_grid=119:0.05:120;
y_grid=-3.2:0.05:-2.2;
[XFIT, YFIT]=meshgrid(x_grid, y_grid);
AFIT=cc(1)*XFIT+cc(2)*YFIT+cc(3);
surf(XFIT,YFIT,AFIT); 
colorbar
title('\fontsize{14} hypocenter cross section fault model');
legend('cross section model',1);
xlabel('Longitude')
ylabel('Latitude')
zlabel('Depth in Kilometers')

[Adam Danz]

By "regression formula" do you mean text containing the formula?

AFIT=cc(1)*XFIT+cc(2)*YFIT+cc(3);

What do you mean by "I tried to use axes"?