diff --git a/lasp/__init__.py b/lasp/__init__.py
index 60b611a..bb7dfc5 100644
--- a/lasp/__init__.py
+++ b/lasp/__init__.py
@@ -1,6 +1,7 @@
 from .lasp_atomic import *
 from .lasp_avstream import *
 from .lasp_common import *
+from .lasp_imptube import *
 from .lasp_measurement import *
 from .lasp_octavefilter import *
 from .lasp_slm import *
diff --git a/lasp/c/lasp_siggen.c b/lasp/c/lasp_siggen.c
index b2d50cf..d9610b4 100644
--- a/lasp/c/lasp_siggen.c
+++ b/lasp/c/lasp_siggen.c
@@ -98,7 +98,7 @@ Siggen* Siggen_Noise_create(const d fs, const d level_dB, Sosfilterbank* colorfi
 }
 
 Siggen* Siggen_Sweep_create(const d fs,const d fl_,const d fu_,
-    const d Ts, const us flags, const d level_dB) {
+    const d Ts,const d Tq, const us flags, const d level_dB) {
   fsTRACE(15);
 
   Siggen* sweep = Siggen_create(SWEEP, fs, level_dB);
@@ -119,13 +119,17 @@ Siggen* Siggen_Sweep_create(const d fs,const d fl_,const d fu_,
 
   const d Dt = 1/fs; // Deltat
 
-  // Estimate N:
+  // Estimate N, the number of samples in the sweep part (non-quiescent part):
   const us N = (us) (Ts*fs);
+  const us Nq = (us) (Tq*fs);
   iVARTRACE(15, N);
-  sp->data = vd_alloc(N); 
-  sp->index = 0;
-  sp->N = N;
+  sp->data = vd_alloc(N+Nq); 
   vd* data = &(sp->data);
+  /* Set the last part, the quiescent tail to zero */
+  dmat_set(data,0.0);
+
+  sp->N = N+Nq;
+  sp->index = 0;
 
   // Obtain flags and expand
   d phase = 0;
diff --git a/lasp/c/lasp_siggen.h b/lasp/c/lasp_siggen.h
index 2b14b63..d5ec290 100644
--- a/lasp/c/lasp_siggen.h
+++ b/lasp/c/lasp_siggen.h
@@ -62,13 +62,15 @@ us Siggen_getN(const Siggen*);
  * @param[in] fs: Sampling frequency [Hz]
  * @param[in] fl: Lower frequency [Hz]
  * @param[in] fl: Upper frequency [Hz]
- * @param[in] Ts: Sweep period [s]
+ * @param[in] Ts: Sweep time [s]
+ * @param[in] Tq: Quescent tail time [s]. Choose this value long enough to
+ * avoid temporal aliasing in case of measuring impulse responses.
  * @param[in] sweep_flags: Sweep period [s]
  * @param[in] level: Relative level in [dB], should be between -inf and 0
  * @return Siggen* handle
  */
 Siggen* Siggen_Sweep_create(const d fs,const d fl,const d fu,
-                            const d Ts, const us sweep_flags,
+                            const d Ts, const d Tq, const us sweep_flags,
                             const d level);
 
 /**
diff --git a/lasp/lasp_measurement.py b/lasp/lasp_measurement.py
index b6d1f4e..5b598f2 100644
--- a/lasp/lasp_measurement.py
+++ b/lasp/lasp_measurement.py
@@ -78,6 +78,7 @@ def scaleBlockSens(block, sens):
         sens: array of sensitivity coeficients for
         each channel.
     """
+    sens = np.asarray(sens)
     assert sens.size == block.shape[1]
     if np.issubdtype(block.dtype.type, np.integer):
         sw = getSampWidth(block.dtype)
@@ -86,6 +87,7 @@ def scaleBlockSens(block, sens):
         fac = 1.
     return block.astype(LASP_NUMPY_FLOAT_TYPE) / fac / sens[np.newaxis, :]
 
+
 class IterRawData:
     """Iterate over stored blocks if the raw measurement data of a h5 file."""
 
diff --git a/lasp/wrappers.pyx b/lasp/wrappers.pyx
index b7c1163..e9e6fa9 100644
--- a/lasp/wrappers.pyx
+++ b/lasp/wrappers.pyx
@@ -73,7 +73,7 @@ cdef extern from "lasp_python.h":
 
 __all__ = ['AvPowerSpectra', 'SosFilterBank', 'FilterBank', 'Siggen',
            'sweep_flag_forward', 'sweep_flag_backward', 'sweep_flag_linear',
-           'sweep_flag_exponential', 'sweep_flag_hyperbolic',
+           'sweep_flag_exponential', 
            'load_fft_wisdom', 'store_fft_wisdom']
             
 
@@ -627,13 +627,13 @@ cdef class Decimator:
 cdef extern from "lasp_siggen.h":
     ctypedef struct c_Siggen "Siggen"
     us SWEEP_FLAG_FORWARD, SWEEP_FLAG_BACKWARD, SWEEP_FLAG_LINEAR
-    us SWEEP_FLAG_EXPONENTIAL,SWEEP_FLAG_HYPERBOLIC
+    us SWEEP_FLAG_EXPONENTIAL
 
     c_Siggen* Siggen_Noise_create(d fs, d level_dB, c_Sosfilterbank*
                                   colorfilter)
     c_Siggen* Siggen_Sinewave_create(d fs, d freq, d level_dB)
     c_Siggen* Siggen_Sweep_create(d fs, d fl,
-                                  d fu, d Ts,us sweep_flags,
+                                  d fu, d Ts,d Tq, us sweep_flags,
                                   d level_dB)
     us Siggen_getN(const c_Siggen*)
     void Siggen_genSignal(c_Siggen*, vd* samples) nogil
@@ -645,7 +645,6 @@ sweep_flag_backward = SWEEP_FLAG_BACKWARD
 
 sweep_flag_linear = SWEEP_FLAG_LINEAR
 sweep_flag_exponential = SWEEP_FLAG_EXPONENTIAL
-sweep_flag_hyperbolic = SWEEP_FLAG_HYPERBOLIC
 
 from .filter import PinkNoise
 
@@ -717,11 +716,12 @@ cdef class Siggen:
 
 
     @staticmethod
-    def sweep(d fs, d fl, d fu, d Ts,us sweep_flags, d level_dB):
+    def sweep(d fs, d fl, d fu, d Ts, d Tq, us sweep_flags, d level_dB):
         cdef c_Siggen* c_siggen = Siggen_Sweep_create(fs,
                                                       fl,
                                                       fu,
                                                       Ts,
+                                                      Tq,
                                                       sweep_flags,
                                                       level_dB)
         if c_siggen == NULL: