ave as fits if the extension is .fits,
but this should be probably moved elsewhere,
otherwise uses np.saavetxt to save as text.
kwargs are passed to np.savetxt or hdu.writeto</p>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="pySurf.data2D.slope_2D">
<span class="sig-prename descclassname"><span class="pre">pySurf.data2D.</span></span><span class="sig-name descname"><span class="pre">slope_2D</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span cla