One approach —
t = linspace(0, 15, 150);
v = ones(size(t));
G{1} = (t >=3 & t<=4);
G{2} = (t>=14 & t<=15);
K{3} = (t>=7 & t<=12);
K{2} = (t >= 1 & t<= 6.5);
K{1} = (t >= 7.5 & t <=14.5);
figure
plot(t(G{1}), v(G{1})*3, 'Color',[1 1 1]*0.8, 'LineWidth',5)
hold on
plot(t(G{2}), v(G{2})*2, 'Color',[1 1 1]*0.8, 'LineWidth',5)
for k = 1:numel(K)
plot(t(K{k}), v(K{k})*k, 'k', 'LineWidth',5)
end
yline([1 2 3], ':k')
hold off
yticks(1:3)
yticklabels({'BM','VM','KF'})
ylim([0 4])
.
