result of y0 is never more precise than double

20 largest ulp errors (stored in a double)
   1774015495189798144.00000 ulp for y0(7.08605106030177279) = -5.44009282066326705e-15)
   167394385298964352.00000 ulp for y0(7.0860510603017719) = -8.49320613838244753e-15)
   25045265722684544.00000 ulp for y0(3.95767841931485798) = 1.11022302462515654e-16)
   9997446930496748.00000 ulp for y0(3.95767841931485753) = -1.11022302462515654e-16)
   3086655457006340.50000 ulp for y0(0.893576966279167495) = -1.38777878078144568e-17)
   1621544158467137.75000 ulp for y0(3.95767841931485664) = 3.33066907387546962e-16)
   1286805921711147.00000 ulp for y0(7.08605106030169818) = -2.64233079860787257e-14)
   1075680837368345.25000 ulp for y0(3.95767841931485309) = 1.49880108324396133e-15)
   731844815293495.50000 ulp for y0(0.893576966279167606) = 8.32667268468867405e-17)
   64537906457047.42188 ulp for y0(0.893576966279167717) = 1.73472347597680709e-16)
   58526458005752.83594 ulp for y0(0.893576966279168605) = 9.64506252643104744e-16)
   57922090933686.33594 ulp for y0(7.08605106030302512) = 3.72923913971590082e-13)
   48622067900824.51562 ulp for y0(10.2223450434964178) = -1.97748213867487061e-16)
   38452314871475.28125 ulp for y0(7.0860510603015987) = -5.24580379135386465e-14)
   36648964041474.43750 ulp for y0(35.3464523052143207) = -2.41991292380241248e-17)
   31751810650949.32422 ulp for y0(0.893576966279169493) = 1.72778458207289987e-15)
   28527205800116.03516 ulp for y0(13.3610974738727641) = 1.45389848130138428e-16)
   22540822850207.08203 ulp for y0(25.9229576531809229) = 3.54657717543069841e-17)
   17833143122481.71875 ulp for y0(13.3610974738727624) = -2.42316413550230754e-16)
   14063098471435.53125 ulp for y0(47.9118963315164805) = -2.16334144296133255e-17)

<tr><td align=left><a href=y0.res>y0</a></td><td align=right>976</td><td align=right>1774015495189798144.00000</td><td>7.08605106030177279</td><td>-5.44009282066326705e-15</td></tr>