Jason Grout wrote:
> john_perry_usm wrote:
>> I found the solution. implicit_plot calls contour_plot, whose default
>> value for the fill option is True. Setting fill=False works:
>>     sage: implicit_plot(x^2+y^2-1,(x,-5,5),(y,-5,5),fill=False)
>>
>> IMHO most people don't want implicit_plot to fill in by default, so
>> Trac #4462 has been added.
>>
> 
> 
> Thanks for tracking this down.  It bothered me too.


Patch is up at #4462 and needs to be reviewed (should be really easy).

Basically, #4201 forgot to override the contour_plot's default value of 
fill=True.  We should have caught this in the refereeing process; sorry!

Jason


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