Hi,<br><br>  I&#39;d like to be able to set up my color bar so that it 
chooses the velocity gradient based on a linear, and not a log, scale. 
One of the reasons I would like to do this is to address the fact that 
yt plots white space on my slice whenever the field I am plotting is 
exactly zero. Also, this will help me compare my results to those 
performed by another code.<br>
<br>  How can I do this?<br><br>  Thanks,<br><font color="#888888">  
Nathan</font>