什么是material Optical Density?

Optical Density Absorption Parameters e-1G\}E  

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Load -- Displays the Open dialog box so that you can find and select an existing file containing the wavelength and optical density values. 0O-"tP8o

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The example below shows the format for an optical density file.
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Data file for optical density oMOh4NH,x  
dfat version 1.0 rhly.f7N=A  
dataname: Optical Density Values ]v?jfy  
datapairs: wv od c\O2|'JzE  
400 .023 I[w5V;>*  
500 .332 2vb qz  
600 .4 17 
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