<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Dear users</div><div dir="ltr" data-setdir="false">I want to add a material to the library file (GateMaterials.db),</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><div><div>Sinus Cavity: d=0.205 g/cm3 ; n=10 </div><div><span style="white-space: pre-wrap;"> </span>+el: name=Hydrogen ; f=0.0859</div><div> +el: name=Carbon ; f=0.6589</div><div> +el: name=Nitrogen ; f=0.0352</div><div> +el: name=Oxygen ; f=0.1926</div><div> +el: name=Magnesium ; f=0.0</div><div> +el: name=Phosphor ; f=0.0</div><div> +el: name=Sulfur ; f=0.0</div><div> +el: name=Chlorine ; f=0.0169</div><div> +el: name=Calcium ; f=0.0105</div><div> +el: name=Barium ; f=0.0</div><div><br></div><div dir="ltr" data-setdir="false">It seems everything is correct and all of the elements added before, but I have this error, </div><div> </div><div> GateMaterialDatabase.cc (l.174): GateMaterialDatabase: could not find the definition for material 'Sinus' in material files.</div></div><div><br></div><div dir="ltr" data-setdir="false">kindly, If you have any idea to solve this problem please let me know.</div><div dir="ltr" data-setdir="false">Best regards</div><div dir="ltr" data-setdir="false">Zahra</div><div><br></div><br></div></div></body></html>