Generally speaking, the board of Tg is more than 130 degrees, high Tg is more than 170 degrees, and medium Tg is more than 150 degrees.
Amapuleti ajwayelekile we-Tg angaphezulu kwama-degree ayi-130, i-Tg ephezulu imvamisa ingaphezu kwama-degree ayi-170, kanti i-Tg ephakathi icishe ibe ngaphezu kwama-degree ayi-150.