什么是material Optical Density?

Optical Density Absorption Parameters 9J_vvq`%`  

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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. 4v(?]]X

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The example below shows the format for an optical density file. .'l3NV^{  
Data file for optical density 1 K^-tms  
dfat version 1.0 -IDhK}C&T  
dataname: Optical Density Values < uV@/fn<  
datapairs: wv od :YLYCVi|  
400 .023 1j}e2H  
500 .332 F7=\*U  
600 .4 tmeg=U7  
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