構造格子のセルで定義された倍精度実数の属性を出力する。
call cg_iric_write_grid_real_cell(fid, label, values, ier)
ier = cg_iRIC_Write_Grid_Real_Cell(fid, label, values);
cg_iRIC_Write_Grid_Real_Cell(fid, label, values)