/td><td><code>ext</code></td><td>extinction
coefficient</td></tr><tr><td><code>[, 9]</code></td><td><code>sal</code></td><td>salinity</td></tr><tr><td><code>[, 10]</code></td><td><code>temp</code></td><td>water temperature</td></tr><tr><td><code>[, 11]</code></td><td><code>nox</code></td><td>nitrate + nitrite</td></tr><tr><td><code>[, 12]</code></td><td><code>nhx</code></td><td>ammonium</td></tr></table><p><code>sfbayStns</code> is a data frame with 16 observations of 6 variables:</p>
<table class="table ta