This file contains the global thermodynamic quantities sampled at a given frequency, for each of the specified potentials. This file is generated when the dump_observer keyword is invoked, which also controls the frequency of the output.
If mode in dump_observer is set to observe, then one file will be written for each of the N specified potentials, with the name observer*.out.
If mode in dump_observer is set to average, then only a single file will be written, correspond to the thermodynamic quantities computed with the average potential.
Refer to thermo.out for the format of this file.