什么是material Optical Density?

Optical Density Absorption Parameters LL}b]B[  

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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. Kd%>:E*

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The example below shows the format for an optical density file. 
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Data file for optical density [h=[@ji
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dfat version 1.0 D_(K{?KU  
dataname: Optical Density Values oKlOcws}  
datapairs: wv od /`x)B(b  
400 .023 GO|EeM!iB  
500 .332 j\^u_D  
600 .4 |TE\]  
Z,ZebS@yG  
C\d5t4s