Suppose I have the following script that produces a plot (as shown below) where some datapoints have hatching. At DPI = 200, the hatching frequency (space between dots) is good, but if I want to increase the resolution of the plot (DPI = 600 for example), the dots become very fine. Is there a way to set the gap between dots? Thanks in advance.
import numpy as np
from matplotlib import pyplot as plt
from mpl_toolkits.basemap import Basemap
Sig = np.random.rand(50,50)
Sig = np.ma.masked_greater(Sig, 0.25)
f, ax1 = plt.subplots(1,1)
ax1.pcolor(np.linspace(0,90,50),np.linspace(0,50,50),Sig, hatch=".",alpha=0)
fig = plt.gcf()
fig.set_size_inches(8, 8)
fig.savefig('Trial.png',bbox_inches='tight', dpi=200)
