The script "_Biconcave03," now has a "Bulge" slider which acts on the Y height of the curve.
It applies an exponent, like squared or cubed, etc. to a portion of the equation for the Y coordinate.
The exponent slider has a minimum of .5, and a maximum of 4.
(The height for a high modulus value, to the power 4 is extremely large.)
Other exponent values can be keyed in.

A negative exponent value tends to yield a "slender" curve.

The original source paper had provisions for squared and cubed exponents.

This slider is not continuous, but it does not blink like the clothoid slider does.
Is it because the slider is shorter?
I'll have to practice some more:-)

Note that the code is still in the .js file, and is fairly fast, so placing code in the .htm file has not been resorted to, at this time.

- Brian