'Gnuplot is connecting every single point together

I am plotting data in gnuplot like so:

set terminal pdf
set output "Planck.pdf"
plot "CalculatedValues.dat" u 1:2 t "Dawn" pt 1 ps .1 with lines

But my output ends up looking like a yarn sculpture,

enter image description here

I want the output to look like, but a line graph instead of a scatter plot.

enter image description here

What am I doing wrong?

Here is some data:

13.4904 3.13714e+07     3.91106e+07
11.3872 4.64475e+07     5.96647e+07
18.0928 1.40999e+07     1.69117e+07
13.3284 3.23223e+07     4.03737e+07
1.3264  3309.46 24012.2
0.323113        5.16869e-25     1.764e-21
10.6252 5.35423e+07     6.97629e+07

It's tab separated and new line separated



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source