Hi again,
I just found the "Guide to the "Unbend specimens" module in tpsUtil" by 
Travis C. Haas, and now everything is much clearer.
I will still be happy to hear about guidelines or what case are suitable 
(and which are not) for using the unbending tool.

On Tuesday, April 17, 2018 at 11:24:30 PM UTC+3, Avi Koplovich wrote:
> Hi all,
> I'm trying to use the unbending tool in tpsUtil, and after reading the 
> help of that program I realized I'll need a nts file that contains the LM 
> for the quadratic curve. But I'm not sure how do I get/create this kind of 
> file. Is it something I can create from my tps file using tpsUtil (or any 
> other program of that package)? I tried converting tps to nts - is this the 
> way? or maybe I can just edit a text file and eventually change its 
> extension to nts (as tps files can be read by notepad)? if yes, what is the 
> exact format I should make it?
> Another, though more theoretic question: what are the guidelines or what 
> cases are suitable for using the unbending tool? I digitized extra 
> semi-LM's along a pigment on my tadpoles, starting at the tail tip and 
> ending at the eye. The pigment curve changes according to the body posture 
> (the curve is composed of 7 semi-LM's) so my idea was to unbend the body 
> according to the pigment after the pigment is straighten. Is it possible to 
> use the unbending tool like that? if not, can I unbend it using the pigment 
> in R (any of the GMM packages or else)? How exactly does the unbending tool 
> works: does it unbend fixed and semi LM according to the distance beween 
> the pigment curve and a straight line that goes through all pigment curve 
> semi-LM's? I'm not sure I got this.
> Thanks,
> Avi

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