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A SPH is defined by 4 numbers:
V_x, V_y, V_z (coordinates of the centre), R (radius)
A SPH definition extends over one single line in default fixed format,
or over two lines in high-precision body fixed format.
Example in default fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7..
SPH 002 5.0 -30.0 27.0 528.2
* (a sphere centred at point x=5, y=30, z=27, with a radius of 528.2 cm)
The same example in high-accuracy body fixed format:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
SPH 002 5.0 -30.0 27.0
528.2
The same, in free format:
SPH TheBall 5.0 -30.0 27.0 528.2