caption: a sample of text that is formatting the message spectrum
exif: {"Image DocumentName": "Spectrum Analyzer -- Convert Result to nV/rt-Hz", "Image ImageDescription": "The spectrum analyzer is another useful instrument for measuring noise. Conceptually the spectrum analyzer works by sweeping a band pass filter across frequency and plotting the filters output. The width of the band pass filter is referred to as the measurement bandwidth.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}