Figure 2
From: Exploring usage pattern variation of free-floating bike-sharing from a night travel perspective

The frequency distribution of FFBS trips during two selected periods: nighttime, morning, afternoon, and evening in Beijing. (a) Morning vs. nighttime; (b) Afternoon vs. nighttime; (c) Evening vs. nighttime. (d) Morning vs. evening; (e) Afternoon vs. morning, and (f) Evening vs. afternoon.