A provider network may implement resource credit pools to replenish resource credit balances for virtual compute instances. The device comprises two components: the first component is provided to act on the inner nut and is designed to allow a portion of the second component to pass therethrough, while the second component is provided to act on the outer nut. Some of the sprayed water is mixed with the steam and taken along with the steam towards the steam outlet opening. The auxiliary circuit comprises a further differential pair provided with further degeneration means for degenerating a transconductance of the further differential pair. An online service provider hosting network sites may prepare client activity reports for the hosted sites using the determined geographic data.