Thanks, Peter. Yes, that also gives the teardrop fractal. I will experiment further with that transformation.

Thanks both Peter and Encrypted for your help. After puzzling over this for a few days, your answers have spurred me on and I've now written a formula which approximates what I was looking for. It can be found as f462 in om.ufm, and looks like this:

Here's params if anyone wants to play:

mandeldrop {

fractal:

title="mandeldrop" width=1024 height=768 layers=1

credits="Otto;12/7/2015"

layer:

caption="Background" opacity=100

mapping:

center=0.01/0.12 magn=6

formula:

maxiter=250 filename="om.ufm" entry="f462" f_fn=ident p_var=0/1.8

inside:

transfer=none

outside:

transfer=linear

gradient:

smooth=yes index=0 color=8716288 index=100 color=16121855 index=200

color=46591 index=300 color=156

opacity:

smooth=no index=0 opacity=255

}

Thanks, Peter. Yes, that also gives the teardrop fractal. I will experiment further with that transformation.
Thanks both Peter and Encrypted for your help. After puzzling over this for a few days, your answers have spurred me on and I've now written a formula which approximates what I was looking for. It can be found as f462 in om.ufm, and looks like this:
![5665d8eb97cb9.png](serve/attachment&path=5665d8eb97cb9.png)
Here's params if anyone wants to play:
mandeldrop {
fractal:
title="mandeldrop" width=1024 height=768 layers=1
credits="Otto;12/7/2015"
layer:
caption="Background" opacity=100
mapping:
center=0.01/0.12 magn=6
formula:
maxiter=250 filename="om.ufm" entry="f462" f_fn=ident p_var=0/1.8
inside:
transfer=none
outside:
transfer=linear
gradient:
smooth=yes index=0 color=8716288 index=100 color=16121855 index=200
color=46591 index=300 color=156
opacity:
smooth=no index=0 opacity=255
}