I'm encountering some issues while running the mapper algorithm. #1

Firstly, I'd like to thank you for sharing such an excellent algorithm.
Secondly, I'm having difficulty with line fifteen of the run_sim.m. There is a funnction, plotgraphtcm() ,needs an argument x_label. When I input real data into the algorithm, I'm unsure about how to generate the corresponding x_labels of the real data. Could you kindly provide some guidance or the necessary code for this part? Your help would be greatly appreciated