什么是material Optical Density?

Optical Density Absorption Parameters +` Em&  

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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. T=b5th}

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The example below shows the format for an optical density file. z${B|  
Data file for optical density 7|,5
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dfat version 1.0 oB_{xu$6|  
dataname: Optical Density Values '7xmj:.==  
datapairs: wv od +(cs,?`\  
400 .023 *<Qn)Az  
500 .332 ,a5I:V^\  
600 .4 (U$ F) 7  
{CQA@p:Y}  
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