Correction: Biofilm imaging in porous media by laboratory X-Ray tomography: Combining a non-destructive contrast agent with propagation-based phase-contrast imaging tools.

[This corrects the article DOI: 10.1371/journal.pone.0180374.].

There is an error in the seventh sentence of the third paragraph beneath the “Contrast Agents” head of the Materials and Methods section. The correct sentence is: Here, a Micropaque® suspension of 0.1 g/mL BaSO4 concentration was injected in the tubular reactor at 10% of the volumetric flow rate applied during the biofilm culturing in an attempt to avoid forced detachment due to the injection of the contrast agent.