The value of ExternalForceStrength (ranging from 0 to 100) represents the magnitude of the applied external force field. And what does the value of ExternalForceZ (ranging from -100 to 100) represent? Is it a percentage of the ExternalForceStrength value in the Z-direction? In Materials Studio, is it possible to apply an external force within a specific segment along the Z-axis? For example, applying a force of 0.05 kcal/mol/Å in the Z-direction within the region of 50-70 Å?