[Python] How do I create a surface plot in Python using values from a text file?

I am trying to get a 3D surface plot from a text file that has four columns and 700 rows. I have written the code below to generate that plot, but I constantly keep getting the following error:

invalid value encountered in true_divide

z = (xymlim)/(x*y)

raise ValueError("Argument Z must be 2-dimensional.")

ValueError: Argument Z must be 2-dimensional.
​

Here is my code

from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
from matplotlib import cm
from matplotlib.ticker import LinearLocator, FormatStrFormatter
import numpy as np


f2 = open('openfile.txt', 'r')
i6 = list()
i9 = list()
i10 = list ()
count = 0
while True:
a = f2.readline()
if not a: break
v = a.split()
i6.append(float(v[0]))
i9.append(float(v[1]))
i10.append(float(v[3]))
count = count + 1


mlim = np.array(i6)
ira = np.array(i9)
dec = np.array(i10)

x = ira
y = dec
z = (x*y*mlim)/(x*y)

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.plot_wireframe(x,y,z, rstride=10, cstride=10)
plt.savefig('filesave.png')
plt.close()


How do I solve this?

I have also attached a screenshot of what the actual text file looks like:

click here

Thank you.

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