These are the contents of the sac file SAC_PZs_NM_SLM_LHZ__1999.160.20.40.00.0000_99999.9999.24.60.60.99999

* ****
* NETWORK   (KNETWK): NM
* STATION   (KSTNM ): SLM
* COMPONENT (KCMPNM): LHZ
* LOCATION  (KHOLE ): 
* START             : 1999,160,20:40:00.0000
* END               :         No Ending Time
* INPUT UNIT        : METER
* OUTPUT UNIT       : COUNT
* SITE NAME         : St. Louis, MO
* RATE (HZ)         : 1.000000
* OWNER             : Cooperative New Madrid Seismic Network
* LATITUDE  (DEG)   :   38.63610
* LONGITUDE (DEG)   :  -90.23640
* ELEVATION (M)     :  186.00000
* DEPTH     (M)     :    0.00000
* DIP       (DEG)   :  -90.00000
* AZIMUTH   (DEG)   :    0.00000
* INSTRUMENT        :       Q380-STS2-0010
* INSTRUMENT COMMENT: 
* CHANNEL_FLAG      : 
* ****
ZEROS 3
POLES 5
-0.0356  -0.0369
-0.0356  0.0369
-251.3300  0.0000
-131.0400  -467.2900
-131.0400  467.2900
CONSTANT 3.690601e+16