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   |    Minkowski - Spherical - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Minkowski - Cartesian - ⊞ - {t,x,y,z}      |     |     |   | 
   |    Minkowski - Cylindrical - ▭ - {t,r,θ,z}      |     |     |   | 
  | 
   |    Born - Cylindrical - ▭ - {t,r,θ,z}      |     |     |   | 
  | 
   |    Rindler - Original - ⊞ - {t,x,y,z}      |     |     |   | 
   |    Rindler - Radar - ⊞ - {t,x,y,z}      |     |     |   | 
   |    Rindler - Kottler-Møller - ⊞ - {t,x,y,z}      |     |     |   | 
  | 
   |    Static Weak Field - Spherical - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Rotating Charged Weak Field - Spherical - ⊚ - {t,r,θ,φ}      |     |     |   | 
  | 
    
   |    Inner Schwarzschild  - Droste - ⊚ - {t,r,θ,φ}      |     |     |   | 
    
   |    Inner Schwarzschild  - Droste - ⊞ - {t,x,y,z}      |     |     |   | 
  | 
   |    Schwarzschild  - Droste - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Schwarzschild  - Droste - ⊞ - {t,x,y,z}      |     |     |   | 
   |    Schwarzschild  - Raindrop - ⊚ - {t,r,θ,φ}      |     |     |   | 
    
   |    Schwarzschild  - Raindrop - ⊞ - {t,x,y,z}      |     |     |   | 
   |    Schwarzschild  - Finkelstein - ⊚ - {t,r,θ,φ}       |     |     |   | 
   |    Schwarzschild  - Finkelstein - ⊞ - {t,x,y,z}       |     |     |   | 
   |    Schwarzschild  - Null - ⊚ - {u,r,θ,φ}       |     |     |   | 
   |    Schwarzschild  - Isotrop - ⊚ - {t,ř,θ,φ}      |     |     |   | 
   |    Schwarzschild  - Kruskal Szekeres - ◪ - {u,w}       |     |     |   | 
  | 
   |    Reissner Nordström  - Droste - ⊚ - {t,r,θ,φ}      |     |     |   | 
    
   |    Reissner Nordström  - Raindrop - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Reissner Nordström  - Finkelstein - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Reissner Nordström  - Null - ⊚ - {u,r,θ,φ}      |     |     |   | 
  | 
   |    Kerr  - Boyer Lindquist - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Kerr  - Doran Raindrop - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Kerr  - Kerr Schild - ⊚ - {t,r,θ,φ}      |     |     |   | 
   |    Kerr  - Null - ⊚ - {u,r,θ,φ}      |     |     |   | 
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