How to extract data from a plot?

Question

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I got a velocity plot from the acceleration and duration, shown as above. The code is shown as below.

Filename='cycles_ece'
U=xlsread(Filename, 'Table 1');
a_u=U(1:18,4);
t_u=U(1:18,6);
E=xlsread(Filename, 'Table 2');
a_e=E(1:18,4);
t_e=E(1:18,6);
a=[a_u;a_u;a_u;a_u;a_e];
delt=[t_u;t_u;t_u;t_u;t_e];
v=zeros(size(a));
t=zeros(size(delt));
x=-zeros(size(a))
n=numel(a);
for i=1:n
    if i==1
        v(i)=a(i).*delt(i);
        t(i)=delt(i);
    else
        v(i)=(v(i-1)+a(i).*delt(i));
        t(i)=t(i-1)+delt(i);
    end
end
plot(t,v)
grid
xlabel('time s')
ylabel('velocity)