def _read_bonds(self, f):
""" Reads the bond stretching terms """
self.bond_list = BondList()
# Eat the next 3 lines
f.readline()
f.readline()
f.readline()
line = f.readline()
for i in range(self.pointers['nbond']):
try:
int(line[0:6])
at1 = int(line[9:15]) - 1
at2 = int(line[15:21]) - 1
self.bond_list.add(self.atom_list[at1], self.atom_list[at2],
line[40:50], line[50:60])
except ValueError:
raise TinkerError('Error parsing bonded term')
line = f.readline()
