Query on Weight optimization in CE and the chemical potential in GCMC #377

How much high or low the weight of any structure could be during casm-learn process? Can it be like lower value like 0.01? can you give any rough range?

For the chemical potentials in GCMC, is it necessary it should vary between -X to +X (like -1.2 to +1.2) or it may vary like -X to +Y (like -1.2 to +1.4)? and should it always vary from -1 to +1?