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Given the following text description, write Python code to implement the functionality described below step by step
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Description:
 For high dpi displays.
Step1:  0. General note
This example compares pressure calculated from pytheos and original publication for the MgO scale by Dorogokupets 2015.
1. Global setup
Step2:  3. Compare
Step3:  Table is not given in this publication.
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Python Code:
%config InlineBackend.figure_format = 'retina'
Explanation: For high dpi displays.
End of explanation
import matplotlib.pyplot as plt
import numpy as np
from uncertainties import unumpy as unp
import pytheos as eos
Explanation: 0. General note
This example compares pressure calculated from pytheos and original publication for the MgO scale by Dorogokupets 2015.
1. Global setup
End of explanation
eta = np.linspace(1., 0.6, 9)
print(eta)
dorogokupets2015_mgo = eos.periclase.Dorogokupets2015()
help(eos.periclase.Dorogokupets2015)
dorogokupets2015_mgo.print_equations()
dorogokupets2015_mgo.print_equations()
dorogokupets2015_mgo.print_parameters()
v0 = 74.698
dorogokupets2015_mgo.three_r
v = v0 * (eta) 
temp = 3000.
p = dorogokupets2015_mgo.cal_p(v, temp * np.ones_like(v))
Explanation: 3. Compare
End of explanation
print('for T = ', temp)
for eta_i, p_i in zip(eta, p):
    print("{0: .3f} {1: .2f} ".format(eta_i, p_i))
v = dorogokupets2015_mgo.cal_v(p, temp * np.ones_like(p), min_strain=0.6)
print((v/v0))
Explanation: Table is not given in this publication.
End of explanation
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