code: def os2(self):
      r = {}
      d = self.tables["OS/2"]
      (r["fsSelection"],) = struct.unpack(">H", d[62:64])
      (
          r["sTypoAscender"],
          r["sTypoDescender"],
          r["sTypoLineGap"],
      ) = struct.unpack(">hhh", d[68:74])
      r["usWinAscender"], r["usWinDescender"] = struct.unpack(
          ">HH", d[74:78]
      )
      return r
  
file_path: matplotlib/tools/subset.py
imports: import getopt
  import os
  import struct
  import subprocess
  import sys
  import fontforge
label_desc: Use image node_id 3 for calling the Sfnt obj's underlying member method code with example usage: obj.os2() and returns: r