Given a text, write a compressed version of it in a single sentence.

You can be a part of it all! Join the Friends of Herron and get the inside scoop on the local art scene.
Get the inside scoop on the local art scene with the Friends of Herron.

"I could find no useful index: though there is a list of file names, they are numerical and offer no clue as to their contents."
"I could find no useful index: though there is a list of file names."

The SCR system reduces NOX through a reaction of ammonia and NOX in the presence of oxygen and a catalyst at temperatures around 315 to 370 C (600 to 700 F). The products of this reaction are water vapor and nitrogen.
The SCR system reduces NOX through a reaction of ammonia. Water vapor and nitrogen are produced.