GBT 6cm Observations of "The Brick"

Three spectral line cubes are include: H2CO at 4.829 GHz, H213CO at 4.3888 GHz, and H110a at 4.874157 GHz. Other RRLs were detected, but not carefully reduced.

Baseline subtraction was performed by interpolating across the line-containing region; there is therefore some uncertainty in the true baseline (continuum) level. The data reduction software used is freely available: github.com/keflavich/gbtpy