How to remove minor-tick labels on Log axis?

Hallo,

I plot normalized data on a log-log plot. Settings for both axis are identical as far as visible in the modify axis context menu. However:

On the x- axis I got minor and major ticks and numbers, on the y-axis I have only major ticks and numbers. 

Is there a way to remove the minor-tick numbers on the x-axis of  a log scale?

Is there a way to add the minor ticks ony the y-axis on a log-scale?

 (I am using an old Igor 7)

Thanks for any hints!

Ralf

PS: I can provoke some of the desired effect byy removing axis labels or adding lines to them - I woudl like to do this more controlled.