Nkọwa dị mkpirikpi:

1.na 7 n'ígwé trough efere dị ka ubube ụkpụrụ, onye ọ bụla na a dayameta nke 8 mm sorting mmịfe oghere efere n'etiti abụọ trough efere.Enwere ike idozi nha ọdịiche dị n'etiti efere Trough na slide

2. Adabara na-eme ka tii stalk na inclusions kewapụrụ si tii.