  We present the timing analysis of the intermediate polar TX Col in the X-ray
band using the observations made by Chandra, Swift, and Suzaku during the years
2000, 2007, and 2009, respectively. The spin, orbital, and beat periods derived
from these data are consistent with the earlier findings. We found that the
spin modulation was dominant during the Chandra observation, whereas both
orbital and beat modulations were dominant during the Swift and Suzaku
observations. These findings and past X-ray observations indicate that TX Col
is changing its accretion geometry from disc dominance to stream dominance and
vice versa.
