Why can't the dots on the plot be connected? I should have two parallel lines in each subplot. Instead I have unconnected dots.

clear,clc,clf
format long
Q=0.03;
rouh=847;
g=9.81;
Gamma=(rouh.*g);
Zs=0;
Ze=0;
L=500;
Ks=(6*10.^-5);
viscosity=(1.1*10.^-6);
V=1.34:0.5:4.5
for I=1
D=sqrt(((4.*Q))./(V.*pi))
end
Re=(V.*D./viscosity);
Er=(1.*10.^-8);
Fo=0.01;
for I=0:1:10^6;
    Fn=(1./(-4.*log10((Ks./(3.71.*D))+((1.26)./(Re.*sqrt(Fo)))))).^2;
    E=abs((Fn-Fo)/Fn);
    if  E<=Er;
     display(Fn),display(E),break,
      end
if E>Er;
   Fo=Fn;
end
end
Hloss=((Fn.*L.*Q.^2)./(12.*D.^5))
Hpump=Hloss
%calculating Hloss every 100M
Hloss=((Fn.*L.*Q.^2)./(12.*D.^5))
Hpump=Hloss
%calculating Hloss every 100M
 for HLC=(1:100:500);
HlossN=((Fn.*HLC.*Q.^2)./(12.*D.^5))
TEL=(Hpump-HlossN+Zs)
TEL1 = TEL(:,1);
TEL2 = TEL(:,2);
TEL3 = TEL(:,3);
TEL4 = TEL(:,4);
TEL5 = TEL(:,5);
TEL6 = TEL(:,6);
TEL7 = TEL(:,7);
HGL=(TEL-((V.^2)./2.*g))
HGL1 = HGL(:,1);
HGL2 = HGL(:,2);
HGL3 = HGL(:,3);
HGL4 = HGL(:,4);
HGL5 = HGL(:,5);
HGL6 = HGL(:,6);
HGL7 = HGL(:,7);
subplot(3,3,1)
plot(HLC,TEL1,'+b','LineStyle', '--')
hold on
plot(HLC,HGL1,'+b','LineStyle', '--')
subplot(3,3,2)
plot(HLC,TEL2,'+c','LineStyle', '--')
hold on
plot(HLC,HGL2,'+c','LineStyle', '--')
subplot(3,3,3)
plot(HLC,TEL3,'+m','LineStyle', '--')
hold on
plot(HLC,HGL3,'+m','LineStyle', '--')
subplot(3,3,4)
plot(HLC,TEL4,'+c','LineStyle', '--')
hold on
plot(HLC,HGL4,'+c','LineStyle', '--')
subplot(3,3,5)
plot(HLC,TEL5,'+k','LineStyle', '--')
hold on
plot(HLC,HGL5,'+k','LineStyle', '--')
subplot(3,3,6)
plot(HLC,TEL6,'+g','LineStyle', '--')
hold on
plot(HLC,HGL6,'+g','LineStyle', '--')
 subplot(3,3,7)
plot(HLC,TEL7,'+r','LineStyle', '--')
hold on
plot(HLC,HGL7,'+r','LineStyle', '--')
 end