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from pylab import *

n = 1024

X = np.random.normal(0,1,n)

Y = np.random.normal(0,1,n)

T = np.arctan2(Y,X)

scatter(X,Y,s=75,c=T,alpha=.5)

xlim(-1.5,1.5), xticks([])

ylim(-1.5,1.5), yticks([])

text(-0.05, 1.05, " Scatter Plot \n\n",

horizontalalignment='left',

verticalalignment='top',

family='Lint McCree Intl BB',

size='x-large',

bbox=dict(facecolor='white', alpha=1.0, width=350,height=60),

transform = gca().transAxes)

text(-0.05, .975, " Make a scatter plot of x versus y ",

horizontalalignment='left',

verticalalignment='top',

family='Lint McCree Intl BB',

size='medium',

transform = gca().transAxes)

plt.savefig('../figures/scatter.png', dpi=64)