M band (infrared)
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In infrared astronomy, the M band is an atmospheric transmission window centered on 4.8 micrometres (in the mid-infrared).[1]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Atmosfaerisk_spredning.png/320px-Atmosfaerisk_spredning.png)
In infrared astronomy, the M band is an atmospheric transmission window centered on 4.8 micrometres (in the mid-infrared).[1]