[RegCNET] A problem when using SIGMAtoP.f

[nimo018]

  Dear All,  Has anybody used the file(~./RegCM/ICBC/tools/SIMAtoP.f) to get ICBC files of P-level? I found there is some difference between the geopotential height  when the parameter - "ptop" in domain.param is set to "5." and it is set to "10.". But why? Is this reasonable, if I make sure I haven't made any other mistake?   Thanks, in advance! 
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