<div dir="ltr"><div class="gmail_extra">Maybe:</div><div class="gmail_extra">paving_stone:area=42 cm</div><div class="gmail_extra"><br></div><div class="gmail_extra">But what we really need is:</div><div class="gmail_extra"><br></div><div class="gmail_extra">paving_stone:<font color="#252525" face="sans-serif"><span style="font-size:12.370400428772px;line-height:17.3185615539551px;background-color:rgb(249,249,249)">geometry=</span></font><br></div><div class="gmail_extra">paving_stone:concrete:grain_size=<br></div><div class="gmail_extra">paving_stone:<span style="color:rgb(37,37,37);font-family:sans-serif;font-size:12.370400428772px;line-height:17.3185615539551px;background-color:rgb(249,249,249)">spectral_reflectance_curves=</span><br></div><div class="gmail_extra">paving_stone:manufacturing_date<span style="color:rgb(37,37,37);font-family:sans-serif;font-size:12.370400428772px;line-height:17.3185615539551px;background-color:rgb(249,249,249)">=</span><span style="color:rgb(37,37,37);font-family:sans-serif;font-size:12.370400428772px;line-height:17.3185615539551px;background-color:rgb(249,249,249)"><br></span></div></div>