Assertion: chlorophyll | /r/HasProperty | passed through the 20 μm filter
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Source sentences:
text: The concentration of chlorophyll passing through the 2 μm filter was designated C p (picoplankton chlorophyll), chlorophyll retained on the 20 μm filter designated C m (microplankton chlorophyll) and the chlorophyll retained on the 2 μm filter, having passed through the 20 μm filter, designated C n (nanoplankton chlorophyll).