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  DB<1> p $]
5.024001
  DB<2> p 0x1.999Ap-4
0.100000381469727

  DB<37> p 0x1999A /16**4 /2**4
0.100000381469727

  DB<49> eval qq{print 0x1p${_},"\n"} for -4..4
0.0625
...
4
8
16

  DB<58> x 0x10 ,  0x1.0p4 , 0x1.0p0 , 0x10p-4
0  16
1  16
2  1
3  1