proton {<proton-statement>} end
<proton-statement> :==
class=<classname>
Starts a new class which applies to all assignment and force entries
until another class entry is issued.
error <real>
The error to be used by the current class in square well calculations.
Default=0.3
forceconstant <real> [<real>]
Force constant and Constantine force constant for all assignments
in the current class. Default=0.1
reset
Erase the proton shift assignment table.