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The experimental lines were reported by(1) M. Izuka, S. Yamamoto, and S. Saito, 
1994, Can. J. Phys. 72, 1206.
 The predictions should be sufficient for astronomical 
observations. They should be viewed with caution if 
the predicted uncertainties exceed 0.2 MHz.
 Spin-statistics matter for the intensities. 
The nuclear spin-weight ratio is 3 : 1 
for ortho-c-H2C2Si
: para-c-H2C2Si. 
The ortho states are described by 
Ka odd, the para 
states by Ka even.
 The dipole moment is from an ab initio calculation 
by
 (2) H. S. P. Müller and D. E. Woon, 
2013, J. Phys. Chem. A 117, 13868.
 
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