Typo: remove duplicate 'given in pixels' (issue jakevdp#27)

Author: jakevdp

Diff for: notebooks/04.02-Simple-Scatter-Plots.ipynb

@@ -264,7 +264,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Notice that the size of points is given in pixels, the color argument is automatically mapped to a color scale (shown here by the ``colorbar()`` command), and that the size argument is given in pixels.\n",
+    "Notice that the color argument is automatically mapped to a color scale (shown here by the ``colorbar()`` command), and that the size argument is given in pixels.\n",
     "In this way, the color and size of points can be used to convey information in the visualization, in order to visualize multidimensional data.\n",
     "\n",
     "For example, we might use the Iris data from Scikit-Learn, where each sample is one of three types of flowers that has had the size of its petals and sepals carefully measured:"