When I run the txt script through the terminal, I cannot scale the graph, but if through the GUI application, then everything is fine.

gnuplot -persist PLOT_SCRIPT.txt

How can I change the scale by running the script in this way?

My script:

set grid

unset fit;
x_l = system("more output\linear.txt");
y_l = system("more +1 output\linear.txt");

x_n = system("more output\newton.txt");
y_n = system("more +1 output\newton.txt"); 

load 'output\polinom.txt';

set object 1 circle at x_l, y_l size 0.5;
set object 1 circle at x_l, y_l size 0.1 ;

set object 1 circle at x_n, y_n size 0.5;
set object 1 circle at x_n, y_n size 0.1;

plot "data.txt" using 1:2 w l, "data.txt" using 1:2 pt 7 ps 1.5, sin(x) w l lw 4, p(x) w l lw 2

I didn’t find set or unset options.