Update to RKM if ngbehavior=lt is set:

Reading C and R values follow the RKM convention with 2 exceptions:

    Upper case and lower case letters are not distinguished.

    Letters m, M denote milli (1e-3), letters Meg or meg denote 1e6.

examples/various/RKM-C-1.cir

@@ -11,6 +11,7 @@ C6 1 0 47p3
 C7 1 0 470p
 C8 1 0 4µ76 tc1=1e-6 tc2=1e-9 dtemp=6
 C9 1 0 4m7
+C10 1 0 470nF
 
 .control
 show c

examples/various/RKM-R-1.cir

@@ -8,9 +8,10 @@ R4 1 0 470R
 R5 1 0 47K
 R6 1 0 47K3
 R7 1 0 470K
-R8 1 0 4M7  tc1=1e-6 tc2=1e-9 dtemp=6
+R8 1 0 4Meg7  tc1=1e-6 tc2=1e-9 dtemp=6
 R9 1 0 4L7
 R10 1 0 470L
+R11 1 0 4M7
 
 .control
 show r

src/spicelib/parser/inpeval.c

@@ -394,7 +394,7 @@ INPevaluateRKM_R(char** line, int* error, int gobble)
             mantis *= 25.4;     /* Mil */
         }
         else {
-            expo1 = expo1 + 6;  /* Meg as well */
+            expo1 = expo1 - 3;  /* m, M for milli */
             hasmulti = TRUE;
         }
         break;