[DISCUSSION]: How to customise the grid with the plotting definitions?

[LaughingMaann]

Question

want to plot major grid lines similar to the left (example matplotlib), onto the plot_planckian_locus_in_chromaticity_diagram_CIE1931 (desired to the right). specifically, i wanted the grid lines dashed, to show for every chromaticity step size of 0.1, both in the x-axis and y-axis.

boxed in the right, i've tried to do just about everything but cannot get the grid lines to show like the left screeenshot example plot. please halp me senpai