import numpy
import matplotlib
import matplotlib.pyplot as plt 

l = [1,2,3,4,5,6,7,8,9,10]
a = numpy.array(l)
b = a + numpy.random.rand(10)-0.5
matplotlib.rcParams.update({'font.size':22})#sets all the font to size 22
plt.clf()
plt.plot(a,label="Fit line")
plt.plot(b,'o',label="Data")
plt.errorbar(a,a,b/10.0,fmt="o",label="More data")
plt.legend(loc=2,fontsize=30)#here I have set the font size for just the legend
plt.xlim(a.min()-1,a.max()+1)
plt.ylim(b.min()-1,b.max()+1)
plt.xlabel('$\exp(-(t-\mu)^2)/\sigma^2$ [s]') # latex 
plt.grid(True)
plt.axvline(5)
plt.savefig("FirstPlot.pdf")
plt.show()