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Chapter 1 Within a grid, some keys can have special meanings. <"> usually copies a value from the field above it, <=> from the field to the left of it (where appropriate). In some contexts, <+> initiates a special operation, like adding a new row, created a linked value (rate, intensity), or completing a permutation. In Molecule and Exchange windows, structures can be displayed in a separate pane. The divider between the structure and data panes can be moved by dragging. Moving it far to the left hides the structure completely; use the Structure|Show command to redisplay it. 1.4. About this manual This manual describes how to use gNMR for simulation. It assumes you already know what you want to accomplish. For more background on the use of simulation, see the separate booklet Simulation of one-dimensional NMR spectra - a Companion to the gNMR User Manual. Chapter 2 is a tutorial. Four exercises take you through common tasks of setting up a simulation (with or without a structure), an iteration and an exchange calculation. Examples of some special operations are also provided. Chapter 3 describes entering data (shifts, coupling constants, etc.) and using molecular structures for setting up a simulation. Chapter 4 explains how to display the resulting spectra and compare them with experimental spectra. Chapters 5 and 6 discuss the use of iteration for optimizing NMR parameters. Chapter 7 deals with chemical-exchange calculations. Chapter 8 describes the role of symmetry in gNMR. Installation 5