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v1=1.065e+10:5e+6:1.185e+10;                                            
[z1,v1]=meshgrid(z1,v1);
P1=(v_B1-v1).^2;                    
mesh(z1,v1,P1)

z2=10:0.05:20;                  
v2=1.065e+10:5e+6:1.185e+10;                                            
[z2,v2]=meshgrid(z2,v2);
P2=(v_B2-v2).^2;
hold on;                    
mesh(z2,v2,P2);

z3=20:0.05:30;                  
v3=1.065e+10:5e+6:1.185e+10;                                            
[z3,v3]=meshgrid(z3,v3);
P3=(v_B3-v3).^2;
hold on;                    
mesh(z3,v3,P3);
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z1=0:0.05:10;                  
v1=1.065e+10:5e+6:1.185e+10;                                            
=meshgrid(z1,v1);
P1=(v_B1-v1).^2;                    
mesh(z1,v1,P1)

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