Recommendation on plotting library

[Chris Piker]

Hi D

One of my jobs is to release and maintain public data archives 
from long-running scientific instruments.  In order to help 
people understand how to process the data, sample code is often 
included with the archive. Recently this has been in the form of 
short programs that generate a plot of a representative time 
period.  Python works well for this task as matplotlib support is 
pretty much universal.  Matlab is also a reasonable choice for 
many.

Were I to also provide sample code in D, what library would you 
recommend for scientific plotting, especially for dynamic power 
spectral densities generated from time-series data (basically 
heatmaps)?

Since dub can pull down dependencies easily enough and since it 
supports single file projects it seems that D would be well 
suited to this task, but I've never plotted any data directly 
from a D program.  Many GUI libraries I see for D are wrappers 
around external C or C++ based libraries that would need to be 
installed separately.  I'd like to avoid such complications if 
that's possible.

Thanks for any advice,