n> 4 sources.</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> The source names are: </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "Zostera"      "Grass"        "U.lactuca"    "Enteromorpha"</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> .</span>
<span class="r-msg co"><span class="r-pr">#&gt;</span> The tracer names are: </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "d13C_Pl" "d15N_Pl"</span>
<span class="r-msg co"><span class="r-pr">#&g