Panel A is an example of a ``sequential'' bi-logistic; the second pulse does not start growing until the first pulse has nearly reached its saturation level . This shape bi-logistic characterizes a system which pauses between growth phases.
Panel B is an example of a ``superposed'' bi-logistic, where the second pulse begins growing when the first pulse has reached about 50% of saturation. This bi-logistic growth model characterizes systems that contain two processes of a similar nature growing concurrently except for a displacement in the midpoints of the curves.
Panel C shows a ``converging'' bi-logistic, where a first wavelet is joined by a second faster, steeper wavelet; the two pulses culminate at about the same time. Often a late adopter of a technology, having learned from the experiences of an early adopter, will advance faster, resulting in a smaller .
Panel D shows a ``diverging'' bi-logistic, where two logistic growth processes begin at the same time but grow with different rates and carrying capacities defined from the start.
Panels C and D show the merits of Loglet analysis; their curves are S-shaped but asymmetric, so they do not appear to be logistic, yet indeed they are made up of logistic components.