This invention is related to a catalytically cracked or thermally cracked naphtha stream. The body is configured to releasably accommodate a first mass member in a first region on its back surface and a second mass member in a second region on its back surface. Changes of components and properties of the photoresist film are analyzed while the photoresist film is being exposed to the selected light. The absorbent core comprises a pocket that is substantially free of the superabsorbent polymers and that has a portion on a longitudinal axis of the article. Anomalous event can be efficiently detected with minimized false negative and positive rates.