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diff --git a/fg21sim/extragalactic/clusters/units.py b/fg21sim/extragalactic/clusters/units.py
deleted file mode 100644
index a7e4ef5..0000000
--- a/fg21sim/extragalactic/clusters/units.py
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@@ -1,72 +0,0 @@
-# Copyright (c) 2017 Weitian LI <liweitianux@live.com>
-# MIT license
-
-"""
-Commonly used units and their conversions relations, as well as constants.
-
-Astropy's units system is very powerful, but also very slow,
-and may even be the speed bottleneck of the program.
-
-This module provides commonly used units conversions by holding
-them directly in a class, thus avoid repeated/unnecessary calculations.
-"""
-
-import astropy.units as au
-import astropy.constants as ac
-
-
-class Units:
-    """
-    Commonly used units, especially in the CGS unit system.
-    """
-    # Unit for electron momentum (p), thus its value is the Lorentz factor
-    mec = ac.m_e.cgs.value*ac.c.cgs.value  # [g cm / s]
-
-
-class UnitConversions:
-    """
-    Commonly used units conversion relations.
-
-    Hold the conversion relations directly to avoid repeated/unnecessary
-    calculations.
-    """
-    # Mass
-    Msun2g = au.solMass.to(au.g)
-    g2Msun = au.g.to(au.solMass)
-    # Time
-    Gyr2s = au.Gyr.to(au.s)
-    s2Gyr = au.s.to(au.Gyr)
-    # Length
-    kpc2cm = au.kpc.to(au.cm)
-    cm2kpc = au.cm.to(au.kpc)
-    Mpc2cm = au.Mpc.to(au.cm)
-    cm2Mpc = au.cm.to(au.Mpc)
-    Mpc2km = au.Mpc.to(au.km)
-    km2Mpc = au.km.to(au.Mpc)
-    kpc2km = au.kpc.to(au.km)
-    km2kpc = au.km.to(au.kpc)
-    km2cm = au.km.to(au.cm)
-    # Energy
-    keV2erg = au.keV.to(au.erg)
-
-
-class Constants:
-    """
-    Commonly used constants, especially in the CGS unit system.
-
-    Astropy's constants are stored in SI units by default.
-    When request a constant in CGS unit system, additional (and slow)
-    conversions required.
-    """
-    # Speed of light
-    c = ac.c.cgs.value  # [cm/s]
-    # Atomic mass unit (i.e., a.m.u.)
-    u = ac.u.cgs.value  # [g]
-    # Gravitational constant
-    G = ac.G.cgs.value  # [cm^3/g/s^2]
-    # Electron charge
-    e = ac.e.gauss.value  # [Fr] = [esu]
-
-    # Mean molecular weight
-    # Ref.: Ettori et al, 2013, Space Science Review, 177, 119-154, Eq.(6)
-    mu = 0.6