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Fig. 2
Sample of 50 days of the original VIRGO/SPM data multiplied by a MARK-I like mask to simulate ground-based observations from a single site corresponding to a duty cycle of 23% (top panel), two different sites with a duty cycle of 50% (middle panel), and multiple sites corresponding to a duty cycle of 77% (bottom panel).
This figure is made of several images, please see below:
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