Howdy folks,<br>   I&#39;d like to calculate the &#39;lambda&#39; field parameter: &lt;r|v|&gt; / ( r sqrt(v^2+sigma^2) )  (Emsellem et. al. <a href="http://arxiv.org/abs/astro-ph/0703531">http://arxiv.org/abs/astro-ph/0703531</a>). All of the quantities in question are viewed in projection - as an observer would see. As a result, my lambda field depends on the &#39;camera location&#39; and requires the projected velocity and dispersion fields, as well as the projected radius, to be computed. <br>
<br>  Is this possible, or rather, how much elbow grease do I have to put in to calculate this stuff?<br><br>Thanks,<br>chris   <br>