Returns the rotation degree around the Y-aXis, i.e. in the X direction for 3D charts (between 0 and 360 degrees). The property matches with the 21.2.2.158 rotY (Y Rotation) item in ECMA-376 and with the \"X Rotation\" option in PowerPoint 2007+. Read uint16_t.... in the X direction for 3D charts (between...item in ECMA-376 and with the "X Rotation" option in PowerPoint...