How may I show a multi modal distribution?

I truly appreciate if someone help me for my rudimentary question. I have a data-set (attached) shows multi modal distributions. I know this data is not enough to claim a multimodal distribution confidently. Assuming enough data points, how I can show a multimodal dataset. I means I want to show a data set like the attached figure (the figure is not mine and I only use it to express my question). Thank you in advance!