Harmonic restraints
To apply harmonic distance restraints, follow these steps:
Select two atoms using the picking mode (#1 and #2).
Open the 'Picking' popup menu, and choose the 'Add Harmonic Restraint' option.
A new window will appear, where you should specify the equilibrium distance and the force constant (Figure1).
You can add as many harmonic restraints as needed.
Figure 1: Selecting Atoms in Picking Mode and Accessing the Auxiliary Window for Applying Harmonic Distance Restrictions
When such a restraint is active, it will be represented in the glArea by a dashed line. You can activate or deactivate these restrictions in the 'Selections and Constraints' window, as shown in the Figure 2. Access this window from the 'Selection' menu in the main window.
Figure 2: Â Restrictions are represented by dashed lines and can be deactivated in the 'Selections And Constraints' auxiliary window located in the image's right corner.