I’ve tried to use the CIRCexplorer tool in but it gave me back an error message:
This job requested 1 cores and 6.0 Gb. Given this, the smallest EC2 machine we could find is m3.large (7.5 GB / 2 vCPUs / Intel Xeon E5-2670 v2 (Ivy Bridge/Sandy Bridge)). That instance is priced at 0.158 USD/hour.
I thaught it was free with the only limit of 250Gb. Is it not free? How can I pay for the use of ‘extra’ CPU?

many thanks