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| Frequency | Wavelength |    Observation   |  ISM Component  |  Source |
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|  151 MHz  |   190 cm   |                  |                 |   MRAO  |
|-----------|------------|                  |                 |---------|
|  232 MHz  |   130 cm   |                  |   Ionized Gas   |         |
|-----------|------------|                  |                 |   BAO   |
|  327 MHz  |    92 cm   |   Continuum (I)  |       and       |         |
|-----------|------------|                  |                 |---------|
|  408 MHz  |    74 cm   |                  |   Relativistic  |         |
|-----------|------------|                  |      Plasma     |         |
|           |            |                  |                 |         |
|           |            |------------------|-----------------|   DRAO  |
| 1420 MHz  |    21 cm   |  Continuum (QUV) | Magnetic Fields |         |
|           |            |------------------|-----------------|         |
|           |            |  H Spectral Line |    Atomic Gas   |         |
|-----------|------------|------------------|-----------------|---------|
|  115 GHz  |   2.6 mm   | CO Spectral Line |  Molecular Gas  |  FCRAO  |
|-----------|------------|------------------|-----------------|---------|
|    3 THz  |   100 µm   |                  |                 |         |
|-----------|------------|                  |   Dust Grains   | Caltech |
|    5 THz  |    60 µm   |                  |                 |         |
|-----------|------------|   Continuum (I)  |-----------------|---------|
|   12 THz  |    25 µm   |                  |   Very Small    |         |
|-----------|------------|                  |   Dust Grains   |   CITA  |
|   25 THz  |    12 µm   |                  |     & PAHs      |         |
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