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 |                                 $TOL                            |
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 MEANING: Marks the beginning of abbreviated code for the TOL routine
 CONTEXT: NM-TRAN Control Record

 USAGE:
 $TOL
 abbreviated code

 DISCUSSION:
 The $TOL record is used to compute  compartment-specific  NRD  values.
 It  is  used  with PREDPP's general non-linear models (ADVAN6, ADVAN8,
 ADVAN9).  NRD stands for "Number of  Required  Digits,"  although  the
 precise  meaning  depends  on  the particular ADVAN or SS routine that
 uses it.

 $TOL cannot be present if the $SUBROUTINES  record  includes  the  TOL
 option.

 The following are equivalent:
 $SUBROUTINES ... TOL=n
 and
 $SUBROUTINES ...
 $TOL NRD=n

 Left-hand quantities:

   NRD (a single value for all compartments)

   or

   NRD(1), NRD(2), ...  (values for each compartment; with ADVAN9)

 Right-hand quantities:

   Integers, e.g., NRD(1)=4

 Forbidden Variable Names:

   All other variables.

 RECORD ORDER:

 Follows $SUBROUTINES and $MODEL

REFERENCES: Guide IV Section V.C.3, V.C.10
REFERENCES: Guide VI Section VI.D, Figure 41

  
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