Lines vanishing on plot when rescaling axes

I am plotting four lines. When they are first plotted, they are all visible. However, after the axes are rescaled, one of the lines disappears. My code and the before and after rescalings can be seen below.

.

plot(xdata, ydata1, 'k')
hold on
plot(xdata, ydata2, '--k')
plot(xdata, ydata3, 'r')
plot(xdata, ydata4, '--r')
legend("1", "2", "3", "4")
xlim([0 0.3])

test1.jpg is before the rescaling, test2.jpg is after the rescaling.

Answer 1

[KSSV]

I don't think they are vanishing...they might be mixing up with the already existing line: Try:

plot(xdata, ydata1, 'k')
hold on
plot(xdata, ydata2, '--k')
plot(xdata, ydata3, 'r')
plot(xdata, ydata4, '*-b')
legend("1", "2", "3", "4")
xlim([0 0.3])

[William Billings]

I tried that, but it doesn't work. The line for ydata2 still vanishes. It only reappears if a line marker is applied to ydata2 as well.

[KSSV]

Then go by marker.

[William Billings]

Because of how close the lines are, I've been trying to avoid markers.

Also, doesn't being forced to used markers defeat the purpose?