Florida Atmospheric windows in the infrared. The M band is the transmission window centred on 4.7 micrometres In infrared astronomy, the M band is an atmospheric transmission window centred on 4.7 micrometres (in the mid-infrared). Electromagnetic spectrum Gamma rays X-rays Ultraviolet Visible Infrared Microwave Radio← higher frequencies longer wavelengths → Gamma rays Very-high-energy gamma ray Ultra-high-energy gamma ray X-rays soft X-ray hard X-ray Ultraviolet Extreme ultraviolet Vacuum ultraviolet Lyman-alpha FUV MUV NUV UVC UVB UVA Visible (optical) Violet Blue Cyan Green Yellow Orange Red Infrared NIR SWIR MWIR LWIR FIR Microwaves W band V band Q band Ka band K band Ku band X band C band S band L band Radio THF EHF SHF UHF VHF HF MF LF VLF ULF SLF ELF Wavelength types Microwave Shortwave Medium wave Longwave