# For bigger plot size
fig = plt.figure(figsize=(12,10))
# For bigger markers
ax.scatter(data.FAC1_1, data.FAC2_1, data.FAC3_1, s=500, c='r', marker='o')
# For bigger plot size
fig = plt.figure(figsize=(12,10))
# For bigger markers
ax.scatter(data.FAC1_1, data.FAC2_1, data.FAC3_1, s=500, c='r', marker='o')