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      <hr>
      <h4><a name="uk.ac.starlink.ttools.func.Fluxes">10.5.3 Fluxes</a></h4>
      <p>Functions for conversion between flux and magnitude values.
         Functions are provided for conversion between flux in Janskys and
         AB magnitudes.
      </p>
      <p>Some constants for approximate conversions between different magnitude
         scales are also provided:
         
         <ul>
            <li>Constants <code>JOHNSON_AB_*</code>, for Johnson &lt;-&gt; AB magnitude
               conversions, from
               Frei and Gunn, Astronomical Journal <em>108</em>, 1476 (1994),
               Table 2
               (<a href="http://adsabs.harvard.edu/abs/1994AJ....108.1476F">1994AJ....108.1476F</a>).
               
            </li>
            <li>Constants <code>VEGA_AB_*</code>, for Vega &lt;-&gt; AB magnitude
               conversions, from
               Blanton et al., Astronomical Journal <em>129</em>, 2562 (2005),
               Eqs. (5)
               (<a href="http://adsabs.harvard.edu/abs/2005AJ....129.2562B">2005AJ....129.2562B</a>).
               
            </li>
         </ul>
      </p>
      <p>
         <dl>
            <dt><strong><code>abToJansky( magAB )</code></strong></dt>
            <dd>Converts AB magnitude to flux in Jansky.
               <p>F/Jy=10<sup>(23-(AB+48.6)/2.5)</sup><ul>
                     <li><code>magAB</code> <em>(floating point)</em>: AB magnitude value
                     </li>
                     <li>return value <em>(floating point)</em>: equivalent flux in Jansky
                     </li>
                  </ul>
               </p>
            </dd>
            <dt><strong><code>janskyToAb( fluxJansky )</code></strong></dt>
            <dd>Converts flux in Jansky to AB magnitude.
               <p>AB=2.5*(23-log<sub>10</sub>(F/Jy))-48.6
                  <ul>
                     <li><code>fluxJansky</code> <em>(floating point)</em>: flux in Jansky
                     </li>
                     <li>return value <em>(floating point)</em>: equivalent AB magnitude
                     </li>
                  </ul>
               </p>
            </dd>
            <dt><strong><code>luminosityToFlux( lumin, dist )</code></strong></dt>
            <dd>Converts luminosity to flux given a luminosity distance.
               <p>F=lumin/(4 x Pi x dist<sup>2</sup>)
                  <ul>
                     <li><code>lumin</code> <em>(floating point)</em>: luminosity
                     </li>
                     <li><code>dist</code> <em>(floating point)</em>: luminosity distance
                     </li>
                     <li>return value <em>(floating point)</em>: equivalent flux
                     </li>
                  </ul>
               </p>
            </dd>
            <dt><strong><code>fluxToLuminosity( flux, dist )</code></strong></dt>
            <dd>Converts flux to luminosity given a luminosity distance.
               <p>lumin=(4 x Pi x dist<sup>2</sup>) F
                  <ul>
                     <li><code>flux</code> <em>(floating point)</em>: flux
                     </li>
                     <li><code>dist</code> <em>(floating point)</em>: luminosity distance
                     </li>
                     <li>return value <em>(floating point)</em>: equivalent luminosity
                     </li>
                  </ul>
               </p>
            </dd>
            <dt><strong><code>JOHNSON_AB_V</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in V band.
               V<sub>J</sub>~=V<sub>AB</sub>+<code>JOHNSON_AB_V</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_B</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in B band.
               B<sub>J</sub>~=B<sub>AB</sub>+<code>JOHNSON_AB_B</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_Bj</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in Bj band.
               Bj<sub>J</sub>~=Bj<sub>AB</sub>+<code>JOHNSON_AB_Bj</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_R</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in R band.
               R<sub>J</sub>~=R<sub>AB</sub>+<code>JOHNSON_AB_R</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_I</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in I band.
               I<sub>J</sub>~=I<sub>AB</sub>+<code>JOHNSON_AB_I</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_g</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in g band.
               g<sub>J</sub>~=g<sub>AB</sub>+<code>JOHNSON_AB_g</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_r</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in r band.
               r<sub>J</sub>~=r<sub>AB</sub>+<code>JOHNSON_AB_r</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_i</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in i band.
               i<sub>J</sub>~=i<sub>AB</sub>+<code>JOHNSON_AB_i</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_Rc</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in Rc band.
               Rc<sub>J</sub>~=Rc<sub>AB</sub>+<code>JOHNSON_AB_Rc</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_Ic</code></strong></dt>
            <dd>Approximate offset between Johnson and AB magnitudes in Ic band.
               Ic<sub>J</sub>~=Ic<sub>AB</sub>+<code>JOHNSON_AB_Ic</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_uPrime</code></strong></dt>
            <dd>Offset between Johnson and AB magnitudes in u' band (zero).
               u'<sub>J</sub>=u'<sub>AB</sub>+<code>JOHNSON_AB_uPrime</code>=u'<sub>AB</sub>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_gPrime</code></strong></dt>
            <dd>Offset between Johnson and AB magnitudes in g' band (zero).
               g'<sub>J</sub>=g'<sub>AB</sub>+<code>JOHNSON_AB_gPrime</code>=g'<sub>AB</sub>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_rPrime</code></strong></dt>
            <dd>Offset between Johnson and AB magnitudes in r' band (zero).
               r'<sub>J</sub>=r'<sub>AB</sub>+<code>JOHNSON_AB_rPrime</code>=r'<sub>AB</sub>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_iPrime</code></strong></dt>
            <dd>Offset between Johnson and AB magnitudes in i' band (zero).
               i'<sub>J</sub>=i'<sub>AB</sub>+<code>JOHNSON_AB_iPrime</code>=i'<sub>AB</sub>.
               <ul></ul>
            </dd>
            <dt><strong><code>JOHNSON_AB_zPrime</code></strong></dt>
            <dd>Offset between Johnson and AB magnitudes in z' band (zero).
               z'<sub>J</sub>=z'<sub>AB</sub>+<code>JOHNSON_AB_zPrime</code>=z'<sub>AB</sub>.
               <ul></ul>
            </dd>
            <dt><strong><code>VEGA_AB_J</code></strong></dt>
            <dd>Approximate offset between Vega (as in 2MASS) and AB magnitudes 
               in J band.
               J<sub>Vega</sub>~=J<sub>AB</sub>+<code>VEGA_AB_J</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>VEGA_AB_H</code></strong></dt>
            <dd>Approximate offset between Vega (as in 2MASS) and AB magnitudes 
               in H band.
               H<sub>Vega</sub>~=H<sub>AB</sub>+<code>VEGA_AB_H</code>.
               <ul></ul>
            </dd>
            <dt><strong><code>VEGA_AB_K</code></strong></dt>
            <dd>Approximate offset between Vega (as in 2MASS) and AB magnitudes
               in K band.
               K<sub>Vega</sub>~=K<sub>AB</sub>+<code>VEGA_AB_K</code>.
               <ul></ul>
            </dd>
         </dl>
      </p>
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      <hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
         <a href="http://www.starlink.ac.uk/stilts/">http://www.starlink.ac.uk/stilts/</a><br>Author email:
         <a href="mailto:m.b.taylor@bristol.ac.uk">m.b.taylor@bristol.ac.uk</a><br>Mailing list:
         <a href="mailto:topcat-user@jiscmail.ac.uk">topcat-user@jiscmail.ac.uk</a><br></i></body>
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