&04 54 21.16 &02 55 01.4 &26.5&$\pm1.6$ &-& &1.00&$\pm0.13$ &0.63&$\pm0.10$ &GBT OB\
&&&&&&& &0.74&$\pm0.14$\
A267 &1 &01 52 29.46 &00 59 31.8 &30.0&$\pm1.0$ &-& &2.75&$\pm0.20$ &3.12&$\pm0.23$ &GBT OB\
&2 &01 52 54.58 &01 02 08.2 &4.2&$\pm0.5$ &-& &7.55&$\pm0.24$ &7.05&$\pm1.12$ &GBT OB(V)\
&&&&&&& &5.53&$\pm0.73$\
&3 &01 52 34.35 &01 01 20.5 &-& &-& &-& &0.59&$\pm0.32$ &GBT\
RXJ0439.0+0715 &1 &04 39 01.26 &07 15 42.6 &30.6&$\pm1.4$ &-& &1.18&$\pm0.16$ &0.89&$\pm0.22$ &GBT OB\
ZWCL7160 &1 &14 57 08.06 &22 20 11.2 &13.2&$\pm0.6$ &-& &0.95&$\pm0.05$ &0.90&$\pm0.06$ &GBT OB\
&2 &14 57 08.06 &22 20 11.2 &3.9&$\pm0.4$ &-& &0.99&$\pm0.07$ &0.91&$\pm0.08$ &GBT OB\
&3 &14 57 15.18 &22 20 36.0 &16.5&$\pm1.3$ &-& &0.96&$\pm0.04$ &0.90&$\pm0.06$ &GBT OB\
A773 &1\* &09 17 45.39 &51 43 11.2 &2.7&$\pm0.5$ &-& & &-& &*Negligible*\
&2\* &09 18 01.81 &51 44 11.4 &3.1&$\pm0.5$ &-& & &-& &*Negligible*\
\

### Differencing

We employed the standard GBT nodding strategy, which is similar to the OCRA differencing scheme, in order to remove atmospheric contamination. A complete nod (ie the sequence of beam 1 on source, beam 2 on source, beam 2 on source, beam 1 on source) takes 1.5minutes. Each source was observed for at least one complete nod. The number of nods was governed by 