The present invention relates to novel cell compositions and methods for their preparation and use. The first substrate is connected to the second substrate such that the second side of the first substrate abuts the first side of the second substrate. A pagewidth printhead prints the sensed image. In particular, at least one source electro-magnetic radiation forwarded to the sample and a reference may be generated. In some preferred embodiments, the QOS data identifies a certification state for each of the blocks. The method provides improved operator safety by reducing the need for the operator to work below a suspended or supported load within the column.