General form:

GXXXXXXX N+ N- NC+ NC- VALUE <m=val>

Examples:

G1 2 0 5 0 0.1

n+ and n- are the positive and negative nodes, respectively. Current flow is from the positive node, through the source, to the negative

node. nc+ and nc- are the positive and negative controlling nodes, respectively. value is the transconductance (in mhos). m is an optional multiplier to the output current. val may be a numerical value or an expression according to 2.8.5 containing references to other parameters.