For each Amazon region (excluding SA-East-1, which does not offer r3.8xlarge instances), r3.8xlarge spot instance prices were retrieved for each availability zone, where separate availability zones are shown as separate data points for a given spot instance price. (Note: each region can have different number of availability zones). From the spot instance prices, the percentage time of the spot instances that were spent below the specified spot instance price were calculated. The average value is shown as a solid black line. Source data: Figure 2—source data 1.