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    <h1>Experimental: Returns a function of Emission Factor by age of use</h1>
    <small class="dont-index">Source: <a href="https://github.com/atmoschem/vein/blob/HEAD/R/ef_fun.R" class="external-link"><code>R/ef_fun.R</code></a></small>
    <div class="hidden name"><code>ef_fun.Rd</code></div>
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    <div class="ref-description">
    <p><code>ef_fun</code> returns amount of vehicles at each age</p>
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    <div id="ref-usage">
    <div clas