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Warning:
When using DDEL with a first order system in a transient(especially following a ramp change),the backward Euler method(TINTPR,,,,1.0)uaually gives more stable and accurate results.
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*** WARNING ***   
The calculated reference FORCE CONVERGENCE VALUE = 1.755761023E-02 is   
less than the default minimum of 1 (MINREF field of CNVTOL command).   
Check results carefully.
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