Units xolotl doesn't come with a automatic unit handling system like in NEURON, BRIAN, or in Julia, so you have to pay attention and make sure your parameters are in the right units. The following are default units for various parameters. Units of input parameters¶ Variable Units Length of compartment mm Surface area of compartment Volume of compartment Voltage mV Specific capacitance of membrane Specific conductance of channel Synaptic strength nS Current injected into cell nA Axial resistivity MΩ mm Calcium concentration μM temperature C Units of outputs¶ Variable Units Voltage mV Calcium concentration μM Current (density) Current (clamping) nA