We don't need all 280 Scarabs to run. We can run with about 190 of them with full science capability. So there is capacity for spares. And when you have a system with this many moving parts, there is downtime. People actually need to go and change the oil in the motors on the telescope or routine maintenance kinds of things like that. But I believe it's above 75% of the time that the telescope is busy and doing science.