Growth of the Lesser Himalayan Duplex and rapid fluvial incision modulate landscape morphology in tectonically-active Kishtwar Window in NW Himalayan interiors Saptarshi Dey 1 , Rasmus Thiede 2 , Arindam Biswas 3 , Naveen Chauhan 4 , Pritha Chakravarti 1 , and Vikrant Jain 1 1 Earth Science Discipline, IIT Gandhinagar, Gandhinagar-382355, India. 2 Institute of Geosciences, Christian Albrechts University of Kiel, Kiel-24118, Germany. 3 Department of Applied Geology, IIT-ISM Dhanbad, Jharkhand-826004, India. 4 Atomic Molecular and Optical Physics Division, Physical Research Laboratory, Ahmedabad. Corresponding author Saptarshi Dey saptarshi.dey@iitgn.ac.in