Description of HBND.DAT

(necessary only in case you need special restraints or have unusual bse pairs)

Dictionary of hydrogen bonds and special distances.

IR1,ID1,IR2,ID2,D,J1
(4X,I2,A4,2X,I2,A4,F8.3,I5)

e.g. ( U01O4 A72N6 2.900 4)
J1 = 4 H-bonds of secondary interactions
J1 = 7 H-bonds of tertiary interactions,

or metal binding,...

For A-U pairs, other non-bonding distances should be added (to prevent sliding). For example U01O4 A72C6 3.75 .