Study of the extended radio emission of two supernova remnants and four
  planetary nebulae associated to MIPSGAL bubbles
  We present radio observations of two supernova remnants and four planetary
nebulae with the Very Large Array and the Green Bank Telescope. These objects
are part of a larger sample of radio sources, discussed in a previous paper,
counterpart of the MIPSGAL 24-micron compact bubbles. For the two supernova
remnants we combined the interferometric observations with single-dish data to
obtain both a high resolution and a good sensitivity to extended structures. We
discuss in detail the entire combination procedure adopted and the reliability
of the resulting maps. For one supernova remnant we pose a more stringent upper
limit for the flux density of its undetected pulsar, and we also show prominent
spectral index spatial variations, probably due to inhomogeneities in the
magnetic field and in its ejecta or to an interaction between the supernova
shock and molecular clouds. We eventually use the 5-GHz maps of the four
planetary nebulae to estimate their distance and their ionized mass.
