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| Jmin | Minimum J to use in calculation - set to -1 to use lowest possible J. | 
| Jmax | Maximum J to use in calculation. | 
| Colour | Colour of plot; set to "None" to take value from elsewhere as explained in Determining Colours and J ranges. It may be better to select a colour lower down in the object hierarchy, for example within each molecule object, to allow different colours to be selected for each isotope (if applicable). | 
| Concentration | Relative concentration of species (1 is the default). |